{"id":21916,"date":"2021-12-17T16:34:45","date_gmt":"2021-12-17T09:34:45","guid":{"rendered":"https:\/\/www.vietlearn.org\/post\/?p=21916"},"modified":"2021-12-17T16:34:47","modified_gmt":"2021-12-17T09:34:47","slug":"quan-he-song-song","status":"publish","type":"post","link":"https:\/\/www.vietlearn.org\/kien-thuc\/quan-he-song-song\/","title":{"rendered":"QUAN H\u1ec6 SONG SONG"},"content":{"rendered":"<h1><a id=\"post-21916-_Toc492701526\"><\/a><a id=\"post-21916-_Toc493273876\"><\/a><strong>A \u2013 L\u00dd THUY\u1ebeT CHUNG<\/strong><\/h1>\n<p><strong>I &#8211; <\/strong><a id=\"post-21916-bookmark0\"><\/a><strong>\u0110\u1ea0I C\u01af\u01a0NG V\u1ec0 \u0110\u01af\u1edcNG TH\u1eb2NG V\u00c0 M\u1eb6T PH\u1eb2NG<\/strong><\/p>\n<p><strong>1. M\u1edf \u0111\u1ea7u v\u1ec1 h\u00ecnh h\u1ecdc kh\u00f4ng gian<\/strong><\/p>\n<p>H\u00ecnh h\u1ecdc kh\u00f4ng gian c\u00f3 c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng c\u01a1 b\u1ea3n l\u00e0 \u0111i\u1ec3m, \u0111\u01b0\u1eddng th\u1eb3ng v\u00e0 m\u1eb7t ph\u1eb3ng.<\/p>\n<p><strong>Quan h\u1ec7 thu\u1ed9c:<\/strong> Trong kh\u00f4ng gian:<\/p>\n<ol>\n<li>V\u1edbi m\u1ed9t \u0111i\u1ec3m <img decoding=\"async\" width=\"20\" height=\"23\" class=\"wp-image-21917\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_256-27.png\" alt=\"IMG_256\" \/> v\u00e0 m\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng <img decoding=\"async\" width=\"19\" height=\"24\" class=\"wp-image-21918\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_257-26.png\" alt=\"IMG_257\" \/> c\u00f3 th\u1ec3 x\u1ea3y ra hai tr\u01b0\u1eddng h\u1ee3p:<\/li>\n<\/ol>\n<p><img decoding=\"async\" width=\"16\" height=\"17\" class=\"wp-image-21919\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_258-27.png\" alt=\"IMG_258\" \/> \u0110i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"23\" class=\"wp-image-21920\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_259-25.png\" alt=\"IMG_259\" \/> thu\u1ed9c \u0111\u01b0\u1eddng th\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"19\" height=\"24\" class=\"wp-image-21921\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_260-27.png\" alt=\"IMG_260\" \/> , k\u00ed hi\u1ec7u <img loading=\"lazy\" decoding=\"async\" width=\"58\" height=\"27\" class=\"wp-image-21922\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_261-24.png\" alt=\"IMG_261\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"16\" height=\"17\" class=\"wp-image-21923\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_262-25.png\" alt=\"IMG_262\" \/> \u0110i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"23\" class=\"wp-image-21924\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_263-26.png\" alt=\"IMG_263\" \/> kh\u00f4ng thu\u1ed9c \u0111\u01b0\u1eddng th\u1eb3ng, k\u00ed hi\u1ec7u <img loading=\"lazy\" decoding=\"async\" width=\"58\" height=\"27\" class=\"wp-image-21925\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_264-25.png\" alt=\"IMG_264\" \/><\/p>\n<p>b. V\u1edbi m\u1ed9t \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"23\" class=\"wp-image-21926\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_265-25.png\" alt=\"IMG_265\" \/> v\u00e0 m\u1ed9t m\u1eb7t ph\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"35\" height=\"34\" class=\"wp-image-21927\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_266-25.png\" alt=\"IMG_266\" \/> c\u00f3 th\u1ec3 x\u1ea3y ra hai tr\u01b0\u1eddng h\u1ee3p:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"16\" height=\"17\" class=\"wp-image-21928\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_267-26.png\" alt=\"IMG_267\" \/> \u0110i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"23\" class=\"wp-image-21929\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_268-26.png\" alt=\"IMG_268\" \/> thu\u1ed9c m\u1eb7t th\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"35\" height=\"34\" class=\"wp-image-21930\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_269-26.png\" alt=\"IMG_269\" \/> , k\u00ed hi\u1ec7u <img loading=\"lazy\" decoding=\"async\" width=\"74\" height=\"34\" class=\"wp-image-21931\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_270-24.png\" alt=\"IMG_270\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"16\" height=\"17\" class=\"wp-image-21932\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_271-26.png\" alt=\"IMG_271\" \/> \u0110i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"23\" class=\"wp-image-21933\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_272-26.png\" alt=\"IMG_272\" \/> kh\u00f4ng thu\u1ed9c \u0111\u01b0\u1eddng th\u1eb3ng, k\u00ed hi\u1ec7u <img loading=\"lazy\" decoding=\"async\" width=\"74\" height=\"34\" class=\"wp-image-21934\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_273-24.png\" alt=\"IMG_273\" \/><\/p>\n<p><strong>2. C\u00e1c t\u00ednh ch\u1ea5t th\u1eeba nh\u1eadn c\u1ee7a h\u00ecnh h\u1ecdc kh\u00f4ng gian<\/strong><\/p>\n<p><strong>T\u00ednh ch\u1ea5t th\u1eeba nh\u1eadn 1:<\/strong> C\u00f3 m\u1ed9t v\u00e0 ch\u1ec9 m\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng \u0111i qua hai \u0111i\u1ec3m ph\u00e2n bi\u1ec7t cho tr\u01b0\u1edbc.<\/p>\n<p><strong>T\u00ednh ch\u1ea5t th\u1eeba nh\u1eadn 2:<\/strong> C\u00f3 m\u1ed9t v\u00e0 ch\u1ec9 m\u1ed9t m\u1eb7t ph\u1eb3ng \u0111i qua ba \u0111i\u1ec3m kh\u00f4ng th\u1eb3ng h\u00e0ng cho tr\u01b0\u1edbc.<\/p>\n<p><strong>T\u00ednh ch\u1ea5t th\u1eeba nh\u1eadn 3:<\/strong> T\u1ed3n t\u1ea1i b\u1ed1n \u0111i\u1ec3m kh\u00f4ng c\u00f9ng n\u1eb1m tr\u00ean m\u1ed9t m\u1eb7t ph\u1eb3ng.<\/p>\n<p><strong>T\u00ednh ch\u1ea5t th\u1eeba nh\u1eadn 4:<\/strong> N\u1ebfu hai m\u1eb7t ph\u1eb3ng ph\u00e2n bi\u1ec7t c\u00f3 m\u1ed9t \u0111i\u1ec3m chung th\u00ec ch\u00fang c\u00f3 m\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng chung duy nh\u1ea5t ch\u1ee9a t\u1ea5t c\u1ea3 c\u00e1c \u0111i\u1ec3m chung c\u1ee7a hai m\u1eb7t ph\u1eb3ng \u0111\u00f3.<\/p>\n<p><strong>T\u00ednh ch\u1ea5t th\u1eeba nh\u1eadn 5:<\/strong> Trong m\u1ed7i m\u1eb7t ph\u1eb3ng, c\u00e1c k\u1ebft \u0111\u00e3 bi\u1ebft c\u1ee7a h\u00ecnh h\u1ecdc ph\u1eb3ng \u0111\u1ec1u \u0111\u00fang.<\/p>\n<p><strong>\u0110\u1ecbnh l\u00ed:<\/strong> N\u1ebfu m\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng \u0111i qua hai \u0111i\u1ec3m ph\u00e2n bi\u1ec7t c\u1ee7a m\u1ed9t m\u1eb7t ph\u1eb3ng th\u00ec m\u1ecdi \u0111i\u1ec3m c\u1ee7a \u0111\u01b0\u1eddng th\u1eb3ng \u0111\u1ec1u thu\u1ed9c m\u1eb7t ph\u1eb3ng \u0111\u00f3.<\/p>\n<p><strong>3. \u0110i\u1ec1u ki\u1ec7n x\u00e1c \u0111\u1ecbnh m\u1eb7t ph\u1eb3ng<\/strong><\/p>\n<p>C\u00f3 b\u1ed1n c\u00e1ch x\u00e1c \u0111\u1ecbnh trong m\u1ed9t m\u1eb7t ph\u1eb3ng:<\/p>\n<p><strong>C\u00e1ch 1:<\/strong> M\u1ed9t m\u1eb7t ph\u1eb3ng \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh n\u1ebfu bi\u1ebft n\u00f3 \u0111i qua ba \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"69\" height=\"27\" class=\"wp-image-21935\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_274-25.png\" alt=\"IMG_274\" \/> kh\u00f4ng th\u1eb3ng h\u00e0ng c\u1ee7a m\u1eb7t ph\u1eb3ng, k\u00ed hi\u1ec7u <img loading=\"lazy\" decoding=\"async\" width=\"67\" height=\"34\" class=\"wp-image-21936\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_275-24.png\" alt=\"IMG_275\" \/><\/p>\n<p><strong>C\u00e1ch 2: <\/strong>M\u1ed9t m\u1eb7t ph\u1eb3ng \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh n\u1ebfu bi\u1ebft n\u00f3 \u0111i qua m\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"19\" height=\"24\" class=\"wp-image-21937\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_276-25.png\" alt=\"IMG_276\" \/> v\u00e0 m\u1ed9t \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"23\" class=\"wp-image-21938\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_277-25.png\" alt=\"IMG_277\" \/> kh\u00f4ng thu\u1ed9c <img loading=\"lazy\" decoding=\"async\" width=\"24\" height=\"27\" class=\"wp-image-21939\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_278-26.png\" alt=\"IMG_278\" \/> k\u00ed hi\u1ec7u <img loading=\"lazy\" decoding=\"async\" width=\"60\" height=\"34\" class=\"wp-image-21940\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_279-24.png\" alt=\"IMG_279\" \/><\/p>\n<p><strong>C\u00e1ch 3: <\/strong>M\u1ed9t m\u1eb7t ph\u1eb3ng \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh n\u1ebfu bi\u1ebft n\u00f3 \u0111i qua hai \u0111\u01b0\u1eddng th\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"37\" height=\"27\" class=\"wp-image-21941\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_280-26.png\" alt=\"IMG_280\" \/> c\u1eaft nhau, k\u00ed hi\u1ec7u <img loading=\"lazy\" decoding=\"async\" width=\"55\" height=\"34\" class=\"wp-image-21942\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_281-25.png\" alt=\"IMG_281\" \/><\/p>\n<p><strong>C\u00e1ch 4:<\/strong> M\u1ed9t m\u1eb7t ph\u1eb3ng \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh n\u1ebfu bi\u1ebft n\u00f3 \u0111i qua hai \u0111\u01b0\u1eddng th\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"37\" height=\"27\" class=\"wp-image-21943\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_282-26.png\" alt=\"IMG_282\" \/> song song, k\u00ed hi\u1ec7u <img loading=\"lazy\" decoding=\"async\" width=\"55\" height=\"34\" class=\"wp-image-21944\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_283-25.png\" alt=\"IMG_283\" \/><\/p>\n<p><strong>4. H\u00ecnh ch\u00f3p v\u00e0 t\u1ee9 di\u1ec7n<\/strong><\/p>\n<p><strong>\u0110\u1ecbnh ngh\u0129a:<\/strong> Cho \u0111a gi\u00e1c <img loading=\"lazy\" decoding=\"async\" width=\"76\" height=\"31\" class=\"wp-image-21945\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_284-25.png\" alt=\"IMG_284\" \/> v\u00e0 cho \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"19\" height=\"24\" class=\"wp-image-21946\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_285-26.png\" alt=\"IMG_285\" \/> n\u1eb1m ngo\u00e0i m\u1eb7t ph\u1eb3ng ch\u1ee9a \u0111a gi\u00e1c \u0111\u00f3. N\u1ed1i <img loading=\"lazy\" decoding=\"async\" width=\"19\" height=\"24\" class=\"wp-image-21947\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_286-25.png\" alt=\"IMG_286\" \/> v\u1edbi c\u00e1c \u0111\u1ec9nh <img loading=\"lazy\" decoding=\"async\" width=\"111\" height=\"31\" class=\"wp-image-21948\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_287-26.png\" alt=\"IMG_287\" \/> ta \u0111\u01b0\u1ee3c <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"19\" class=\"wp-image-21949\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_288-26.png\" alt=\"IMG_288\" \/> mi\u1ec1n \u0111a gi\u00e1c <img loading=\"lazy\" decoding=\"async\" width=\"213\" height=\"31\" class=\"wp-image-21950\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_289-27.png\" alt=\"IMG_289\" \/><\/p>\n<p>H\u00ecnh g\u1ed3m <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"19\" class=\"wp-image-21951\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_290-26.png\" alt=\"IMG_290\" \/> tam gi\u00e1c \u0111\u00f3 v\u00e0 \u0111a gi\u00e1c <img loading=\"lazy\" decoding=\"async\" width=\"94\" height=\"31\" class=\"wp-image-21952\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_291-26.png\" alt=\"IMG_291\" \/> \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 h\u00ecnh ch\u00f3p <img loading=\"lazy\" decoding=\"async\" width=\"118\" height=\"31\" class=\"wp-image-21953\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_292-26.png\" alt=\"IMG_292\" \/><\/p>\n<p>Trong \u0111\u00f3:<\/p>\n<table>\n<tbody>\n<tr>\n<td><img loading=\"lazy\" decoding=\"async\" width=\"16\" height=\"17\" class=\"wp-image-21954\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_293-26.png\" alt=\"IMG_293\" \/> \u0110i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"19\" height=\"24\" class=\"wp-image-21955\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_294-26.png\" alt=\"IMG_294\" \/> \u00a0g\u1ecdi l\u00e0 \u0111\u1ec9nh c\u1ee7a h\u00ecnh ch\u00f3p.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"16\" height=\"17\" class=\"wp-image-21956\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_295-25.png\" alt=\"IMG_295\" \/> \u0110a gi\u00e1c <img loading=\"lazy\" decoding=\"async\" width=\"76\" height=\"31\" class=\"wp-image-21957\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_296-25.png\" alt=\"IMG_296\" \/> \u00a0g\u1ecdi l\u00e0 m\u1eb7t \u0111\u00e1y c\u1ee7a h\u00ecnh ch\u00f3p.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"16\" height=\"17\" class=\"wp-image-21958\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_297-25.png\" alt=\"IMG_297\" \/> C\u00e1c \u0111o\u1ea1n th\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"178\" height=\"31\" class=\"wp-image-21959\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_298-25.png\" alt=\"IMG_298\" \/> \u00a0g\u1ecdi l\u00e0 c\u00e1c c\u1ea1nh \u0111\u00e1y c\u1ee7a h\u00ecnh ch\u00f3p.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"16\" height=\"17\" class=\"wp-image-21960\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_299-25.png\" alt=\"IMG_299\" \/> C\u00e1c \u0111o\u1ea1n th\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"137\" height=\"31\" class=\"wp-image-21961\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_300-25.png\" alt=\"IMG_300\" \/> \u00a0g\u1ecdi l\u00e0 c\u00e1c c\u1ea1nh b\u00ean c\u1ee7a h\u00ecnh ch\u00f3p.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"16\" height=\"17\" class=\"wp-image-21962\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_301-25.png\" alt=\"IMG_301\" \/> C\u00e1c mi\u1ec1n tam gi\u00e1c <img loading=\"lazy\" decoding=\"async\" width=\"204\" height=\"31\" class=\"wp-image-21963\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_302-25.png\" alt=\"IMG_302\" \/> \u00a0g\u1ecdi l\u00e0 c\u00e1c m\u1eb7t b\u00ean c\u1ee7a h\u00ecnh ch\u00f3p.<\/td>\n<td><img loading=\"lazy\" decoding=\"async\" width=\"225\" height=\"229\" class=\"wp-image-21964\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_303-25.png\" alt=\"IMG_303\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_303-25.png 225w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_303-25-50x50.png 50w\" sizes=\"(max-width: 225px) 100vw, 225px\" \/><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>N\u1ebfu \u0111\u00e1y c\u1ee7a h\u00ecnh ch\u00f3p l\u00e0 m\u1ed9t mi\u1ec1n tam gi\u00e1c, t\u1ee9 gi\u00e1c, ng\u0169 gi\u00e1c,\u2026 th\u00ec h\u00ecnh ch\u00f3p t\u01b0\u01a1ng \u1ee9ng g\u1ecdi l\u00e0 h\u00ecnh ch\u00f3p tam gi\u00e1c, h\u00ecnh ch\u00f3p t\u1ee9 gi\u00e1c, h\u00ecnh ch\u00f3p ng\u0169 gi\u00e1c,\u2026<\/p>\n<p><strong>Ch\u00fa \u00fd<\/strong><\/p>\n<p>a. H\u00ecnh ch\u00f3p tam gi\u00e1c c\u00f2n \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 h\u00ecnh t\u1ee9 di\u1ec7n.<\/p>\n<p>b. H\u00ecnh t\u1ee9 di\u1ec7n c\u00f3 b\u1ed1n m\u1eb7t l\u00e0 nh\u1eefng tam gi\u00e1c \u0111\u1ec1u hay c\u00f3 t\u1ea5t c\u1ea3 c\u00e1c c\u1ea1nh b\u1eb1ng nhau \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 h\u00ecnh t\u1ee9 di\u1ec7n \u0111\u1ec1u.<\/p>\n<p><strong>II &#8211; \u0110\u01af\u1edcNG TH\u1eb2NG SONG SONG V\u1edaI \u0110\u01af\u1edcNG TH\u1eb2NG<\/strong><\/p>\n<p><strong>1. \u0110\u1ecbnh ngh\u0129a<\/strong><\/p>\n<p>Trong ph\u1ea7n v\u1ecb tr\u00ed t\u01b0\u01a1ng \u0111\u1ed1i c\u1ee7a hai \u0111\u01b0\u1eddng th\u1eb3ng trong kh\u00f4ng gian, ta bi\u1ebft r\u1eb1ng hai \u0111\u01b0\u1eddng th\u1eb3ng ph\u00e2n bi\u1ec7t b\u1ea5t k\u00ec ho\u1eb7c ch\u00e9o nhau ho\u1eb7c song song ho\u1eb7c c\u1eaft nhau. N\u1ebfu hai \u0111\u01b0\u1eddng th\u1eb3ng ph\u00e2n bi\u1ec7t \u0111\u1ed3ng ph\u1eb3ng v\u00e0 kh\u00f4ng c\u1eaft nhau th\u00ec ta n\u00f3i hai \u0111\u01b0\u1eddng th\u1eb3ng \u0111\u00f3 song song v\u1edbi nhau.<\/p>\n<p><em>\u0110\u1ecbnh ngh\u0129a: <\/em><\/p>\n<p>Hai \u0111\u01b0\u1eddng th\u1eb3ng ph\u00e2n bi\u1ec7t <img loading=\"lazy\" decoding=\"async\" width=\"34\" height=\"27\" class=\"wp-image-21965\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_304-25.png\" alt=\"IMG_304\" \/> trong kh\u00f4ng gian \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 song song v\u1edbi nhau, k\u00ed hi\u1ec7u <img loading=\"lazy\" decoding=\"async\" width=\"47\" height=\"24\" class=\"wp-image-21966\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_305-25.png\" alt=\"IMG_305\" \/> n\u1ebfu ch\u00fang \u0111\u1ed3ng ph\u1eb3ng v\u00e0 kh\u00f4ng c\u1eaft nhau.<\/p>\n<p><strong>2. T\u00ednh ch\u1ea5t<\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"231\" height=\"73\" class=\"wp-image-21967\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_306-25.png\" alt=\"IMG_306\" \/><\/p>\n<p><strong>\u0110\u1ecbnh l\u00ed 1: <\/strong>Trong kh\u00f4ng gian cho \u0111\u01b0\u1eddng th\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"19\" height=\"24\" class=\"wp-image-21968\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_307-25.png\" alt=\"IMG_307\" \/> v\u00e0 \u0111i\u1ec3m <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"23\" class=\"wp-image-21969\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_308-25.png\" alt=\"IMG_308\" \/> n\u1eb1m ngo\u00e0i <img loading=\"lazy\" decoding=\"async\" width=\"19\" height=\"24\" class=\"wp-image-21970\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_309-24.png\" alt=\"IMG_309\" \/> . L\u00fac \u0111\u00f3 t\u1ed3n t\u1ea1i duy nh\u1ea5t m\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"19\" class=\"wp-image-21971\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_310-25.png\" alt=\"IMG_310\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"20\" height=\"23\" class=\"wp-image-21972\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_311-24.png\" alt=\"IMG_311\" \/> v\u00e0 song song v\u1edbi \u0111\u01b0\u1eddng th\u1eb3ng d.<\/p>\n<p><strong><em>Ch\u00fa \u00fd:<\/em><\/strong><\/p>\n<p>\u0110\u1ecbnh l\u00ed n\u00e0y cho ta th\u00eam m\u1ed9t c\u00e1ch x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1eddng th\u1eb3ng trong kh\u00f4ng gian: \u0111\u00f3 l\u00e0 \u0111\u01b0\u1eddng th\u1eb3ng \u0111i qua m\u1ed9t \u0111i\u1ec3m v\u00e0 song song v\u1edbi m\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng cho tr\u01b0\u1edbc kh\u00f4ng ch\u1ee9a \u0111i\u1ec3m \u0111\u00f3. K\u1ebft h\u1ee3p v\u1edbi \u0111\u1ecbnh l\u00ed 2 d\u01b0\u1edbi \u0111\u00e2y cho ta m\u1ed9t c\u00e1ch \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh giao tuy\u1ebfn c\u1ee7a hai m\u1eb7t ph\u1eb3ng.<\/p>\n<p><strong>\u0110\u1ecbnh l\u00ed 2 ( V\u1ec1 giao tuy\u1ebfn c\u1ee7a ba m\u1eb7t ph\u1eb3ng):<\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"193\" height=\"116\" class=\"wp-image-21973\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_312-24.png\" alt=\"IMG_312\" \/> <img loading=\"lazy\" decoding=\"async\" width=\"181\" height=\"105\" class=\"wp-image-21974\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_313-23.png\" alt=\"IMG_313\" \/><\/p>\n<p>N\u1ebfu ba m\u1eb7t ph\u1eb3ng ph\u00e2n bi\u1ec7t \u0111\u00f4i m\u1ed9t c\u1eaft nhau theo ba giao tuy\u1ebfn ph\u00e2n bi\u1ec7t th\u00ec ba giao tuy\u1ebfn \u1ea5y ho\u1eb7c \u0111\u1ed3ng quy ho\u1eb7c \u0111\u00f4i m\u1ed9t song song v\u1edbi nhau.<\/p>\n<p><strong><em>H\u1ec7 qu\u1ea3: <\/em><\/strong><\/p>\n<p>N\u1ebfu hai m\u1eb7t ph\u1eb3ng ph\u00e2n bi\u1ec7t ch\u1ee9a hai \u0111\u01b0\u1eddng th\u1eb3ng song song th\u00ec giao tuy\u1ebfn c\u1ee7a ch\u00fang ( n\u1ebfu c\u00f3) c\u0169ng song song v\u1edbi hai \u0111\u01b0\u1eddng th\u1eb3ng \u0111\u00f3 ho\u1eb7c tr\u00f9ng v\u1edbi m\u1ed9t trong hai \u0111\u01b0\u1eddng th\u1eb3ng \u0111\u00f3.<\/p>\n<p>\u0110\u1ebfn \u0111\u00e2y ta c\u00f3 th\u1ec3 b\u1ed5 sung m\u1ed9t ph\u01b0\u01a1ng ph\u00e1p t\u00ecm giao tuy\u1ebfn c\u1ee7a hai m\u1eb7t ph\u1eb3ng:<\/p>\n<p><strong><em>B\u01b0\u1edbc 1:<\/em><\/strong> Ch\u1ec9 ra hai m\u1eb7t ph\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"74\" height=\"34\" class=\"wp-image-21975\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_314-23.png\" alt=\"IMG_314\" \/> l\u1ea7n l\u01b0\u1ee3t ch\u1ee9a hai \u0111\u01b0\u1eddng th\u1eb3ng song song <img loading=\"lazy\" decoding=\"async\" width=\"34\" height=\"27\" class=\"wp-image-21976\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_315-23.png\" alt=\"IMG_315\" \/> .<\/p>\n<p><strong><em>B\u01b0\u1edbc 2:<\/em><\/strong> T\u00ecm m\u1ed9t \u0111i\u1ec3m chung <img loading=\"lazy\" decoding=\"async\" width=\"27\" height=\"23\" class=\"wp-image-21977\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_316-23.png\" alt=\"IMG_316\" \/> c\u1ee7a hai m\u1eb7t ph\u1eb3ng<\/p>\n<p><strong><em>B\u01b0\u1edbc 3:<\/em><\/strong> Khi \u0111\u00f3 <img loading=\"lazy\" decoding=\"async\" width=\"194\" height=\"34\" class=\"wp-image-21978\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_317-23.png\" alt=\"IMG_317\" \/><\/p>\n<p><strong>\u0110\u1ecbnh l\u00ed 3: <\/strong><\/p>\n<p>Hai \u0111\u01b0\u1eddng th\u1eb3ng ph\u00e2n bi\u1ec7t c\u00f9ng song song v\u1edbi \u0111\u01b0\u1eddng th\u1eb3ng th\u1ee9 ba th\u00ec song song v\u1edbi nhau.<\/p>\n<p>Nh\u01b0 v\u1eady, cho hai \u0111\u01b0\u1eddng th\u1eb3ng ph\u00e2n bi\u1ec7t th\u1ecfa m\u00e3n <img loading=\"lazy\" decoding=\"async\" width=\"127\" height=\"60\" class=\"wp-image-21979\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_318-23.png\" alt=\"IMG_318\" \/><\/p>\n<p><strong>3. G\u00f3c gi\u1eefa hai \u0111\u01b0\u1eddng th\u1eb3ng trong kh\u00f4ng gian<\/strong><\/p>\n<p><strong>a) \u0110\u1ecbnh ngh\u0129a<\/strong><\/p>\n<p>G\u00f3c gi\u1eefa hai \u0111\u01b0\u1eddng th\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"19\" class=\"wp-image-21980\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_319-23.png\" alt=\"IMG_319\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"24\" class=\"wp-image-21981\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_320-23.png\" alt=\"IMG_320\" \/> trong kh\u00f4ng l\u00e0 g\u00f3c gi\u1eefa hai \u0111\u01b0\u1eddng th\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"23\" height=\"24\" class=\"wp-image-21982\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_321-22.png\" alt=\"IMG_321\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"23\" height=\"24\" class=\"wp-image-21983\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_322-22.png\" alt=\"IMG_322\" \/> c\u00f9ng \u0111i<\/p>\n<p>qua m\u1ed9t \u0111i\u1ec3m v\u00e0 l\u1ea7n l\u01b0\u1ee3t song song v\u1edbi <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"19\" class=\"wp-image-21984\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_323-20.png\" alt=\"IMG_323\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"24\" class=\"wp-image-21985\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_324-20.png\" alt=\"IMG_324\" \/> .<\/p>\n<p><strong>b. Ph\u01b0\u01a1ng ph\u00e1p t\u00ednh g\u00f3c gi\u1eefa hai \u0111\u01b0\u1eddng th\u1eb3ng trong kh\u00f4ng gian<\/strong><\/p>\n<p><em>B\u01b0\u1edbc 1:<\/em> D\u1ef1ng g\u00f3c<\/p>\n<p>&#8211; T\u00ecm tr\u00ean h\u00ecnh v\u1ebd xem g\u00f3c gi\u1eefa hai \u0111\u01b0\u1eddng th\u1eb3ng c\u00f3 s\u1eb5n kh\u00f4ng?<\/p>\n<p>&#8211; N\u1ebfu kh\u00f4ng c\u00f3 s\u1eb5n th\u00ec ta ti\u1ebfn h\u00e0nh:<\/p>\n<p>+ Ch\u1ecdn m\u1ed9t \u0111i\u1ec3m O b\u1ea5t k\u00ec trong kh\u00f4ng gian.<\/p>\n<p>+ Qua O d\u1ef1ng \u0111\u01b0\u1eddng th\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"105\" height=\"41\" class=\"wp-image-21986\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_325-20.png\" alt=\"IMG_325\" \/> . G\u00f3c nh\u1ecdn hay g\u00f3c vu\u00f4ng t\u1ecdc b\u1edfi <img loading=\"lazy\" decoding=\"async\" width=\"42\" height=\"27\" class=\"wp-image-21987\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_326-20.png\" alt=\"IMG_326\" \/> ch\u00ednh l\u00e0 g\u00f3c gi\u1eefa <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"19\" class=\"wp-image-21988\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_327-20.png\" alt=\"IMG_327\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"24\" class=\"wp-image-21989\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_328-19.png\" alt=\"IMG_328\" \/> .<\/p>\n<p><strong><em>L\u01b0u \u00fd: <\/em><\/strong><\/p>\n<p>+ Ta th\u01b0\u1eddng l\u1ea5y \u0111i\u1ec3m O thu\u1ed9c m\u1ed9t trong hai \u0111\u01b0\u1eddng th\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"19\" class=\"wp-image-21990\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_329-19.png\" alt=\"IMG_329\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"24\" class=\"wp-image-21991\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_330-19.png\" alt=\"IMG_330\" \/> .<\/p>\n<p>+ Ch\u1ecdn O sao cho g\u00f3c gi\u1eefa <img loading=\"lazy\" decoding=\"async\" width=\"42\" height=\"27\" class=\"wp-image-21992\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_331-19.png\" alt=\"IMG_331\" \/> l\u00e0 g\u00f3c c\u1ee7a m\u1ed9t tam gi\u00e1c m\u00e0 \u0111\u1ed9 d\u00e0i c\u00e1c c\u1ea1nh c\u1ee7a n\u00f3 \u0111\u00e3 bi\u1ebft ho\u1eb7c c\u00f3 th\u1ec3 t\u00ednh d\u1ec5 d\u00e0ng<\/p>\n<p><em>B\u01b0\u1edbc 2:<\/em> T\u00ednh g\u00f3c<\/p>\n<p>D\u00f9ng h\u1ec7 th\u1ee9c l\u01b0\u1ee3ng trong tam gi\u00e1c, t\u1ec9 s\u1ed1 l\u01b0\u1ee3ng gi\u00e1c hay \u0111\u1ecbnh l\u00ed cosin, sin. Tr\u01b0\u1eddng h\u1ee3p g\u00f3c gi\u1eefa hai \u0111\u01b0\u1eddng th\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"19\" class=\"wp-image-21993\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_332-19.png\" alt=\"IMG_332\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"24\" class=\"wp-image-21994\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_333-19.png\" alt=\"IMG_333\" \/> b\u1eb1ng <img loading=\"lazy\" decoding=\"async\" width=\"33\" height=\"27\" class=\"wp-image-21995\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_334-18.png\" alt=\"IMG_334\" \/> ta n\u00f3i <img loading=\"lazy\" decoding=\"async\" width=\"49\" height=\"24\" class=\"wp-image-21996\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_335-18.png\" alt=\"IMG_335\" \/> .<\/p>\n<p><strong>III \u2013 \u0110\u01af\u1edcNG TH\u1eb2NG V\u00c0 M\u1eb6T PH\u1eb2NG SONG SONG<\/strong><\/p>\n<p><strong>1. V\u1ecb tr\u00ed t\u01b0\u01a1ng \u0111\u1ed1i c\u1ee7a \u0111\u01b0\u1eddng th\u1eb3ng v\u00e0 m\u1eb7t ph\u1eb3ng<\/strong><\/p>\n<p>Cho \u0111\u01b0\u1eddng th\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"19\" class=\"wp-image-21997\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_336-18.png\" alt=\"IMG_336\" \/> v\u00e0 m\u1eb7t ph\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"41\" height=\"34\" class=\"wp-image-21998\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_337-18.png\" alt=\"IMG_337\" \/> C\u0103n c\u1ee9 v\u00e0o s\u1ed1 \u0111i\u1ec3m chung c\u1ee7a \u0111\u01b0\u1eddng th\u1eb3ng v\u00e0 m\u1eb7t ph\u1eb3ng ta c\u00f3 ba tr\u01b0\u1eddng h\u1ee3p sau:<\/p>\n<p>a. \u0110\u01b0\u1eddng th\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"19\" class=\"wp-image-21999\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_338-18.png\" alt=\"IMG_338\" \/> v\u00e0 m\u1eb7t ph\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"35\" height=\"34\" class=\"wp-image-22000\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_339-18.png\" alt=\"IMG_339\" \/> kh\u00f4ng c\u00f3 \u0111i\u1ec3m chung, t\u1ee9c l\u00e0:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"204\" height=\"34\" class=\"wp-image-22001\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_340-18.png\" alt=\"IMG_340\" \/><\/p>\n<p>b. \u0110\u01b0\u1eddng th\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"19\" class=\"wp-image-22002\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_341-18.png\" alt=\"IMG_341\" \/> v\u00e0 m\u1eb7t ph\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"35\" height=\"34\" class=\"wp-image-22003\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_342-18.png\" alt=\"IMG_342\" \/> ch\u1ec9 c\u00f3 m\u1ed9t \u0111i\u1ec3m chung, t\u1ee9c l\u00e0:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"146\" height=\"34\" class=\"wp-image-22004\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_343-18.png\" alt=\"IMG_343\" \/> c\u1eaft <img loading=\"lazy\" decoding=\"async\" width=\"35\" height=\"34\" class=\"wp-image-22005\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_344-18.png\" alt=\"IMG_344\" \/> t\u1ea1i <img loading=\"lazy\" decoding=\"async\" width=\"26\" height=\"27\" class=\"wp-image-22006\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_345-18.png\" alt=\"IMG_345\" \/><\/p>\n<p>c. \u0110\u01b0\u1eddng th\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"19\" class=\"wp-image-22007\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_346-17.png\" alt=\"IMG_346\" \/> v\u00e0 m\u1eb7t ph\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"35\" height=\"34\" class=\"wp-image-22008\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_347-16.png\" alt=\"IMG_347\" \/> c\u00f3 hai \u0111i\u1ec3m chung, t\u1ee9c l\u00e0:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"242\" height=\"34\" class=\"wp-image-22009\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_348-15.png\" alt=\"IMG_348\" \/><\/p>\n<table>\n<tbody>\n<tr>\n<td><img loading=\"lazy\" decoding=\"async\" width=\"208\" height=\"139\" class=\"wp-image-22010\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_349-15.png\" alt=\"IMG_349\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"204\" height=\"34\" class=\"wp-image-22011\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_350-15.png\" alt=\"IMG_350\" \/><\/td>\n<td><img loading=\"lazy\" decoding=\"async\" width=\"207\" height=\"144\" class=\"wp-image-22012\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_351-15.png\" alt=\"IMG_351\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"157\" height=\"34\" class=\"wp-image-22013\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_352-15.png\" alt=\"IMG_352\" \/> \u00a0c\u1eaft <img loading=\"lazy\" decoding=\"async\" width=\"41\" height=\"34\" class=\"wp-image-22014\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_353-15.png\" alt=\"IMG_353\" \/><\/td>\n<td><img loading=\"lazy\" decoding=\"async\" width=\"205\" height=\"97\" class=\"wp-image-22015\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_354-15.png\" alt=\"IMG_354\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"239\" height=\"34\" class=\"wp-image-22016\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_355-15.png\" alt=\"IMG_355\" \/><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>2. \u0110i\u1ec1u ki\u1ec7n \u0111\u1ec3 m\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng song song v\u1edbi m\u1ed9t m\u1eb7t ph\u1eb3ng<\/strong><\/p>\n<table>\n<tbody>\n<tr>\n<td><strong>\u0110\u1ecbnh l\u00ed 1:<\/strong> N\u1ebfu \u0111\u01b0\u1eddng th\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"19\" class=\"wp-image-22017\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_356-15.png\" alt=\"IMG_356\" \/> \u00a0kh\u00f4ng n\u1eb1m trong m\u1eb7t ph\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"35\" height=\"34\" class=\"wp-image-22018\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_357-15.png\" alt=\"IMG_357\" \/> \u00a0v\u00e0 song song v\u1edbi m\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng n\u00e0o \u0111\u00f3 trong <img loading=\"lazy\" decoding=\"async\" width=\"35\" height=\"34\" class=\"wp-image-22019\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_358-15.png\" alt=\"IMG_358\" \/> \u00a0th\u00ec <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"19\" class=\"wp-image-22020\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_359-15.png\" alt=\"IMG_359\" \/> \u00a0song song v\u1edbi <img loading=\"lazy\" decoding=\"async\" width=\"41\" height=\"34\" class=\"wp-image-22021\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_360-15.png\" alt=\"IMG_360\" \/><\/p>\n<p>T\u1ee9c l\u00e0, <img loading=\"lazy\" decoding=\"async\" width=\"69\" height=\"34\" class=\"wp-image-22022\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_361-15.png\" alt=\"IMG_361\" \/> \u00a0th\u00ec n\u1ebfu:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"197\" height=\"34\" class=\"wp-image-22023\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_362-15.png\" alt=\"IMG_362\" \/><\/td>\n<td><img loading=\"lazy\" decoding=\"async\" width=\"213\" height=\"143\" class=\"wp-image-22024\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_363-13.png\" alt=\"IMG_363\" \/><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>3. T\u00ednh ch\u1ea5t<\/strong><\/p>\n<table>\n<tbody>\n<tr>\n<td><strong>\u0110\u1ecbnh l\u00ed 2:<\/strong> N\u1ebfu \u0111\u01b0\u1eddng th\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"19\" class=\"wp-image-22025\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_364-15.png\" alt=\"IMG_364\" \/> \u00a0song song v\u1edbi m\u1eb7t ph\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"35\" height=\"34\" class=\"wp-image-22026\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_365-15.png\" alt=\"IMG_365\" \/> \u00a0th\u00ec m\u1ecdi m\u1eb7t ph\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"37\" height=\"34\" class=\"wp-image-22027\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_366-15.png\" alt=\"IMG_366\" \/> \u00a0ch\u1ee9a <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"19\" class=\"wp-image-22028\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_367-15.png\" alt=\"IMG_367\" \/> \u00a0m\u00e0 c\u1eaft <img loading=\"lazy\" decoding=\"async\" width=\"35\" height=\"34\" class=\"wp-image-22029\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_368-15.png\" alt=\"IMG_368\" \/> \u00a0th\u00ec s\u1ebd c\u1eaft theo m\u1ed9t giao tuy\u1ebfn song song v\u1edbi <img loading=\"lazy\" decoding=\"async\" width=\"23\" height=\"23\" class=\"wp-image-22030\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_369-15.png\" alt=\"IMG_369\" \/><\/p>\n<p>T\u1ee9c l\u00e0, n\u1ebfu <img loading=\"lazy\" decoding=\"async\" width=\"302\" height=\"74\" class=\"wp-image-22031\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_370-15.png\" alt=\"IMG_370\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_370-15.png 302w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_370-15-300x74.png 300w\" sizes=\"(max-width: 302px) 100vw, 302px\" \/><\/td>\n<td><strong><img loading=\"lazy\" decoding=\"async\" width=\"232\" height=\"157\" class=\"wp-image-22032\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_371-15.png\" alt=\"IMG_371\" \/><\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>H\u1ec7 qu\u1ea3 1:<\/strong> N\u1ebfu m\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng song song v\u1edbi m\u1ed9t m\u1eb7t ph\u1eb3ng th\u00ec n\u00f3 song song v\u1edbi m\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng n\u00e0o \u0111\u00f3 trong m\u1eb7t ph\u1eb3ng.<\/p>\n<table>\n<tbody>\n<tr>\n<td><strong>H\u1ec7 qu\u1ea3 2:<\/strong> N\u1ebfu hai m\u1eb7t ph\u1eb3ng ph\u00e2n bi\u1ec7t c\u00f9ng song song v\u1edbi m\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng th\u00ec giao tuy\u1ebfn (n\u1ebfu c\u00f3) c\u1ee7a ch\u00fang song song v\u1edbi \u0111\u01b0\u1eddng th\u1eb3ng \u0111\u00f3.<\/p>\n<p>T\u1ee9c l\u00e0: <img loading=\"lazy\" decoding=\"async\" width=\"207\" height=\"104\" class=\"wp-image-22033\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_372-15.png\" alt=\"IMG_372\" \/><\/td>\n<td><img loading=\"lazy\" decoding=\"async\" width=\"173\" height=\"173\" class=\"wp-image-22034\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_373-14.png\" alt=\"IMG_373\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_373-14.png 173w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_373-14-150x150.png 150w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_373-14-50x50.png 50w\" sizes=\"(max-width: 173px) 100vw, 173px\" \/><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>H\u1ec7 qu\u1ea3 3:<\/strong> N\u1ebfu <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"19\" class=\"wp-image-22035\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_374-14.png\" alt=\"IMG_374\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"24\" class=\"wp-image-22036\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_375-14.png\" alt=\"IMG_375\" \/> l\u00e0 hai \u0111\u01b0\u1eddng th\u1eb3ng ch\u00e9o nhau th\u00ec qua <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"19\" class=\"wp-image-22037\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_376-13.png\" alt=\"IMG_376\" \/> c\u00f3 m\u1ed9t v\u00e0 ch\u1ec9 m\u1ed9t m\u1eb7t ph\u1eb3ng song song v\u1edbi <img loading=\"lazy\" decoding=\"async\" width=\"23\" height=\"27\" class=\"wp-image-22038\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_377-12.png\" alt=\"IMG_377\" \/><\/p>\n<p><strong>IV &#8211; HAI M\u1eb6T PH\u1eb2NG SONG SONG<\/strong><\/p>\n<p><strong>1. V\u1ecb tr\u00ed t\u01b0\u01a1ng \u0111\u1ed1i c\u1ee7a hai m\u1eb7t ph\u1eb3ng ph\u00e2n bi\u1ec7t<\/strong><\/p>\n<p>Cho 2 m\u1eb7t ph\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"35\" height=\"34\" class=\"wp-image-22039\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_378-11.png\" alt=\"IMG_378\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"42\" height=\"34\" class=\"wp-image-22040\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_379-11.png\" alt=\"IMG_379\" \/> C\u0103n c\u1ee9 v\u00e0o s\u1ed1 \u0111\u01b0\u1eddng th\u1eb3ng chung c\u1ee7a 2 m\u1eb7t ph\u1eb3ng ta c\u00f3 ba tr\u01b0\u1eddng h\u1ee3p sau:<\/p>\n<p>a. Hai m\u1eb7t ph\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"35\" height=\"34\" class=\"wp-image-22041\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_380-11.png\" alt=\"IMG_380\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"37\" height=\"34\" class=\"wp-image-22042\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_381-11.png\" alt=\"IMG_381\" \/> kh\u00f4ng c\u00f3 \u0111\u01b0\u1eddng th\u1eb3ng chung, t\u1ee9c l\u00e0:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"239\" height=\"34\" class=\"wp-image-22043\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_382-11.png\" alt=\"IMG_382\" \/><\/p>\n<p>b. Hai m\u1eb7t ph\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"35\" height=\"34\" class=\"wp-image-22044\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_383-11.png\" alt=\"IMG_383\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"37\" height=\"34\" class=\"wp-image-22045\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_384-11.png\" alt=\"IMG_384\" \/> ch\u1ec9 c\u00f3 m\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng chung, t\u1ee9c l\u00e0:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"175\" height=\"34\" class=\"wp-image-22046\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_385-11.png\" alt=\"IMG_385\" \/> c\u1eaft <img loading=\"lazy\" decoding=\"async\" width=\"42\" height=\"34\" class=\"wp-image-22047\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_386-11.png\" alt=\"IMG_386\" \/><\/p>\n<p>c. Hai m\u1eb7t ph\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"35\" height=\"34\" class=\"wp-image-22048\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_387-9.png\" alt=\"IMG_387\" \/> v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"37\" height=\"34\" class=\"wp-image-22049\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_388-7.png\" alt=\"IMG_388\" \/> c\u00f3 2 \u0111\u01b0\u1eddng th\u1eb3ng chung ph\u00e2n bi\u1ec7t, t\u1ee9c l\u00e0:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"267\" height=\"34\" class=\"wp-image-22050\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_389-6.png\" alt=\"IMG_389\" \/><\/p>\n<table>\n<tbody>\n<tr>\n<td><img loading=\"lazy\" decoding=\"async\" width=\"210\" height=\"134\" class=\"wp-image-22051\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_390-7.png\" alt=\"IMG_390\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"239\" height=\"34\" class=\"wp-image-22052\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_391-6.png\" alt=\"IMG_391\" \/><\/td>\n<td><img loading=\"lazy\" decoding=\"async\" width=\"180\" height=\"168\" class=\"wp-image-22053\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_392-7.png\" alt=\"IMG_392\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"175\" height=\"34\" class=\"wp-image-22054\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_393-7.png\" alt=\"IMG_393\" \/> \u00a0c\u1eaft <img loading=\"lazy\" decoding=\"async\" width=\"42\" height=\"34\" class=\"wp-image-22055\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_394-7.png\" alt=\"IMG_394\" \/><\/td>\n<td><img loading=\"lazy\" decoding=\"async\" width=\"208\" height=\"98\" class=\"wp-image-22056\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_395-7.png\" alt=\"IMG_395\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"268\" height=\"34\" class=\"wp-image-22057\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_396-7.png\" alt=\"IMG_396\" \/><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>2. \u0110i\u1ec1u ki\u1ec7n \u0111\u1ec3 hai m\u1eb7t ph\u1eb3ng song song<\/strong><\/p>\n<p><strong>\u0110\u1ecbnh l\u00ed 1:<\/strong> N\u1ebfu m\u1eb7t ph\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"35\" height=\"34\" class=\"wp-image-22058\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_397-7.png\" alt=\"IMG_397\" \/> ch\u1ee9a hai \u0111\u01b0\u1eddng th\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"37\" height=\"27\" class=\"wp-image-22059\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_398-8.png\" alt=\"IMG_398\" \/> c\u1eaft nhau v\u00e0 c\u00f9ng song song v\u1edbi<\/p>\n<table>\n<tbody>\n<tr>\n<td>m\u1eb7t ph\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"37\" height=\"34\" class=\"wp-image-22060\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_399-8.png\" alt=\"IMG_399\" \/> \u00a0th\u00ec <img loading=\"lazy\" decoding=\"async\" width=\"35\" height=\"34\" class=\"wp-image-22061\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_400-8.png\" alt=\"IMG_400\" \/> \u00a0song song <img loading=\"lazy\" decoding=\"async\" width=\"42\" height=\"34\" class=\"wp-image-22062\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_401-8.png\" alt=\"IMG_401\" \/><\/p>\n<p>T\u1ee9c l\u00e0: <img loading=\"lazy\" decoding=\"async\" width=\"267\" height=\"104\" class=\"wp-image-22063\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_402-8.png\" alt=\"IMG_402\" \/><\/td>\n<td><img loading=\"lazy\" decoding=\"async\" width=\"203\" height=\"118\" class=\"wp-image-22064\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_403-8.png\" alt=\"IMG_403\" \/><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>3. T\u00ednh ch\u1ea5t<\/strong><\/p>\n<p><strong>T\u00ednh ch\u1ea5t 1:<\/strong> Qua m\u1ed9t \u0111i\u1ec3m n\u1eb1m ngo\u00e0i m\u1ed9t m\u1eb7t ph\u1eb3ng, c\u00f3 m\u1ed9t v\u00e0 ch\u1ec9 m\u1ed9t m\u1eb7t ph\u1eb3ng song song v\u1edbi m\u1eb7t ph\u1eb3ng \u0111\u00f3.<\/p>\n<p><strong>H\u1ec7 qu\u1ea3 1:<\/strong> N\u1ebfu \u0111\u01b0\u1eddng th\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"19\" class=\"wp-image-22065\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_404-8.png\" alt=\"IMG_404\" \/> song song v\u1edbi m\u1eb7t ph\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"37\" height=\"34\" class=\"wp-image-22066\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_405-8.png\" alt=\"IMG_405\" \/> th\u00ec qua <img loading=\"lazy\" decoding=\"async\" width=\"17\" height=\"19\" class=\"wp-image-22067\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_406-8.png\" alt=\"IMG_406\" \/> c\u00f3 m\u1ed9t v\u00e0 ch\u1ec9 m\u1ed9t m\u1eb7t ph\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"35\" height=\"34\" class=\"wp-image-22068\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_407-8.png\" alt=\"IMG_407\" \/> song song v\u1edbi <img loading=\"lazy\" decoding=\"async\" width=\"42\" height=\"34\" class=\"wp-image-22069\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_408-8.png\" alt=\"IMG_408\" \/><\/p>\n<table>\n<tbody>\n<tr>\n<td><strong>H\u1ec7 qu\u1ea3 2:<\/strong> Hai m\u1eb7t ph\u1eb3ng ph\u00e2n bi\u1ec7t c\u00f9ng song song v\u1edbi m\u1ed9t m\u1eb7t ph\u1eb3ng th\u1ee9 ba th\u00ec song song v\u1edbi nhau.<\/p>\n<p><strong>T\u00ednh ch\u1ea5t 2:<\/strong> N\u1ebfu hai m\u1eb7t ph\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"35\" height=\"34\" class=\"wp-image-22070\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_409-8.png\" alt=\"IMG_409\" \/> \u00a0v\u00e0 <img loading=\"lazy\" decoding=\"async\" width=\"37\" height=\"34\" class=\"wp-image-22071\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_410-8.png\" alt=\"IMG_410\" \/> \u00a0song song th\u00ec m\u1eb7t ph\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"35\" height=\"34\" class=\"wp-image-22072\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_411-8.png\" alt=\"IMG_411\" \/> \u00a0\u0111\u00e3 c\u1eaft <img loading=\"lazy\" decoding=\"async\" width=\"35\" height=\"34\" class=\"wp-image-22073\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_412-8.png\" alt=\"IMG_412\" \/> \u00a0th\u00ec ph\u1ea3i c\u1eaft <img loading=\"lazy\" decoding=\"async\" width=\"37\" height=\"34\" class=\"wp-image-22074\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_413-8.png\" alt=\"IMG_413\" \/> \u00a0v\u00e0 c\u00e1c giao tuy\u1ebfn c\u1ee7a ch\u00fang song song.<\/p>\n<p>T\u1ee9c l\u00e0: <img loading=\"lazy\" decoding=\"async\" width=\"203\" height=\"104\" class=\"wp-image-22075\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_414-8.png\" alt=\"IMG_414\" \/><\/td>\n<td><strong><img loading=\"lazy\" decoding=\"async\" width=\"219\" height=\"195\" class=\"wp-image-22076\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_415-8.png\" alt=\"IMG_415\" \/><\/strong><\/td>\n<\/tr>\n<tr>\n<td><strong>\u0110\u1ecbnh l\u00ed Ta \u2013 l\u00e9t trong kh\u00f4ng gian: <\/strong>Ba m\u1eb7t ph\u1eb3ng \u0111\u00f4i m\u1ed9t song song ch\u1eafn tr\u00ean hai c\u00e1t tuy\u1ebfn b\u1ea5t k\u00ec c\u00e1c \u0111o\u1ea1n th\u1eb3ng t\u01b0\u01a1ng \u1ee9ng t\u1ef7 l\u1ec7.<\/p>\n<p>T\u1ee9c l\u00e0: <img loading=\"lazy\" decoding=\"async\" width=\"341\" height=\"104\" class=\"wp-image-22077\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_416-8.png\" alt=\"IMG_416\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_416-8.png 341w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_416-8-300x91.png 300w\" sizes=\"(max-width: 341px) 100vw, 341px\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"139\" height=\"58\" class=\"wp-image-22078\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_417-8.png\" alt=\"IMG_417\" \/><\/td>\n<td><img loading=\"lazy\" decoding=\"async\" width=\"193\" height=\"212\" class=\"wp-image-22079\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_418-8.png\" alt=\"IMG_418\" \/><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>4. H\u00ecnh l\u0103ng tr\u1ee5 v\u00e0 h\u00ecnh h\u1ed9p<\/strong><\/p>\n<p><strong>\u0110\u1ecbnh ngh\u0129a h\u00ecnh l\u0103ng tr\u1ee5:<\/strong> H\u00ecnh l\u0103ng tr\u1ee5 l\u00e0 m\u1ed9t h\u00ecnh \u0111a di\u1ec7n c\u00f3 hai m\u1eb7t n\u1eb1m trong hai m\u1eb7t ph\u1eb3ng song song g\u1ecdi l\u00e0 hai \u0111\u00e1y v\u00e0 t\u1ea5t c\u1ea3 c\u00e1c c\u1ea1nh kh\u00f4ng thu\u1ed9c hai c\u1ea1nh \u0111\u00e1y \u0111\u1ec1u song song v\u1edbi nhau.<\/p>\n<table>\n<tbody>\n<tr>\n<td>Trong \u0111\u00f3:<\/p>\n<ul>\n<li>C\u00e1c m\u1eb7t kh\u00e1c v\u1edbi hai \u0111\u00e1y g\u1ecdi l\u00e0 c\u00e1c m\u1eb7t b\u00ean c\u1ee7a h\u00ecnh l\u0103ng tr\u1ee5.<\/li>\n<li>C\u1ea1nh chung c\u1ee7a hai m\u1eb7t b\u00ean g\u1ecdi l\u00e0 c\u1ea1nh b\u00ean c\u1ee7a h\u00ecnh l\u0103ng tr\u1ee5.<\/li>\n<li>T\u00f9y theo \u0111a gi\u00e1c \u0111\u00e1y, ta c\u00f3 h\u00ecnh l\u0103ng tr\u1ee5 tam gi\u00e1c, l\u0103ng tr\u1ee5 t\u1ee9 gi\u00e1c \u2026<\/li>\n<\/ul>\n<p>T\u1eeb \u0111\u1ecbnh ngh\u0129a c\u1ee7a h\u00ecnh l\u0103ng tr\u1ee5, ta l\u1ea7n l\u01b0\u1ee3t suy ra c\u00e1c t\u00ednh ch\u1ea5t sau:<\/p>\n<p>a. C\u00e1c c\u1ea1nh b\u00ean song song v\u00e0 b\u1eb1ng nhau.<\/p>\n<p>b. C\u00e1c m\u1eb7t b\u00ean v\u00e0 c\u00e1c m\u1eb7t ch\u00e9o l\u00e0 nh\u1eefng h\u00ecnh b\u00ecnh h\u00e0nh.<\/p>\n<p>c. Hai \u0111\u00e1y l\u00e0 hai \u0111a gi\u00e1c c\u00f3 c\u00e1c c\u1ea1nh t\u01b0\u01a1ng \u1ee9ng song song v\u00e0 b\u1eb1ng nhau.<\/td>\n<td><img loading=\"lazy\" decoding=\"async\" width=\"230\" height=\"235\" class=\"wp-image-22080\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_419-7.png\" alt=\"IMG_419\" srcset=\"https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_419-7.png 230w, https:\/\/www.vietlearn.org\/kien-thuc\/wp-content\/uploads\/2021\/12\/img_419-7-50x50.png 50w\" sizes=\"(max-width: 230px) 100vw, 230px\" \/><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>\u0110\u1ecbnh ngh\u0129a h\u00ecnh h\u1ed9p:<\/strong> H\u00ecnh l\u0103ng tr\u1ee5 c\u00f3 \u0111\u00e1y l\u00e0 h\u00ecnh b\u00ecnh h\u00e0nh g\u1ecdi l\u00e0 h\u00ecnh h\u1ed9p.<\/p>\n<p>a. H\u00ecnh h\u1ed9p c\u00f3 t\u1ea5t c\u1ea3 c\u00e1c m\u1eb7t b\u00ean v\u00e0 c\u00e1c m\u1eb7t \u0111\u00e1y \u0111\u1ec1u l\u00e0 h\u00ecnh ch\u1eef nh\u1eadt g\u1ecdi l\u00e0 h\u00ecnh h\u1ed9p ch\u1eef nh\u1eadt.<\/p>\n<p>b. H\u00ecnh h\u1ed9p c\u00f3 t\u1ea5t c\u1ea3 c\u00e1c m\u1eb7t b\u00ean v\u00e0 c\u00e1c m\u1eb7t \u0111\u00e1y \u0111\u1ec1u l\u00e0 h\u00ecnh vu\u00f4ng g\u1ecdi l\u00e0 h\u00ecnh l\u1eadp ph\u01b0\u01a1ng.<\/p>\n<table>\n<tbody>\n<tr>\n<td><img loading=\"lazy\" decoding=\"async\" width=\"254\" height=\"228\" class=\"wp-image-22081\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_420-7.png\" alt=\"IMG_420\" \/><\/td>\n<td><img loading=\"lazy\" decoding=\"async\" width=\"213\" height=\"224\" class=\"wp-image-22082\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_421-7.png\" alt=\"IMG_421\" \/><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong> Ch\u00fa \u00fd:<\/strong> C\u00e1c \u0111\u01b0\u1eddng ch\u00e9o c\u1ee7a h\u00ecnh h\u1ed9p c\u1eaft nhau t\u1ea1i trung \u0111i\u1ec3m m\u1ed7i \u0111\u01b0\u1eddng.<\/p>\n<p><strong>5. H\u00ecnh ch\u00f3p c\u1ee5t<\/strong><\/p>\n<table>\n<tbody>\n<tr>\n<td><strong>\u0110\u1ecbnh ngh\u0129a:<\/strong> Cho h\u00ecnh ch\u00f3p <img loading=\"lazy\" decoding=\"async\" width=\"97\" height=\"31\" class=\"wp-image-22083\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_422-7.png\" alt=\"IMG_422\" \/> \u00a0M\u1ed9t m\u1eb7t ph\u1eb3ng <img loading=\"lazy\" decoding=\"async\" width=\"35\" height=\"34\" class=\"wp-image-22084\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_423-7.png\" alt=\"IMG_423\" \/> \u00a0song song v\u1edbi m\u1eb7t ph\u1eb3ng ch\u1ee9a \u0111a gi\u00e1c \u0111\u00e1y c\u1eaft c\u00e1c c\u1ea1nh <img loading=\"lazy\" decoding=\"async\" width=\"137\" height=\"31\" class=\"wp-image-22085\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_424-7.png\" alt=\"IMG_424\" \/> \u00a0theo th\u1ee9 t\u1ef1 t\u1ea1i <img loading=\"lazy\" decoding=\"async\" width=\"118\" height=\"31\" class=\"wp-image-22086\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_425-7.png\" alt=\"IMG_425\" \/> \u00a0H\u00ecnh t\u1ea1o b\u1edfi thi\u1ebft di\u1ec7n <img loading=\"lazy\" decoding=\"async\" width=\"76\" height=\"31\" class=\"wp-image-22087\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_426-7.png\" alt=\"IMG_426\" \/> \u00a0v\u00e0 \u0111\u00e1y <img loading=\"lazy\" decoding=\"async\" width=\"76\" height=\"31\" class=\"wp-image-22088\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_427-7.png\" alt=\"IMG_427\" \/> \u00a0c\u1ee7a h\u00ecnh ch\u00f3p c\u00f9ng v\u1edbi c\u00e1c m\u1eb7t b\u00ean <img loading=\"lazy\" decoding=\"async\" width=\"282\" height=\"31\" class=\"wp-image-22089\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_428-7.png\" alt=\"IMG_428\" \/> \u00a0g\u1ecdi l\u00e0 m\u1ed9t h\u00ecnh ch\u00f3p c\u1ee5t.<\/p>\n<p>Trong \u0111\u00f3:<\/p>\n<ul>\n<li>\u0110\u00e1y c\u1ee7a h\u00ecnh ch\u00f3p g\u1ecdi l\u00e0 \u0111\u00e1y l\u1edbn c\u1ee7a h\u00ecnh ch\u00f3p c\u1ee5t, c\u00f2n thi\u1ebft di\u1ec7n g\u1ecdi l\u00e0 \u0111\u00e1y nh\u1ecf c\u1ee7a h\u00ecnh ch\u00f3p c\u1ee5t.<\/li>\n<\/ul>\n<\/td>\n<td><strong><img loading=\"lazy\" decoding=\"async\" width=\"245\" height=\"279\" class=\"wp-image-22090\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_429-7.png\" alt=\"IMG_429\" \/><\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<ul>\n<li>C\u00e1c m\u1eb7t c\u00f2n l\u1ea1i g\u1ecdi l\u00e0 c\u00e1c m\u1eb7t b\u00ean c\u1ee7a h\u00ecnh ch\u00f3p c\u1ee5t.<\/li>\n<li>C\u1ea1nh chung c\u1ee7a hai m\u1eb7t b\u00ean k\u1ec1 nhau nh\u01b0 <img loading=\"lazy\" decoding=\"async\" width=\"165\" height=\"31\" class=\"wp-image-22091\" src=\"https:\/\/www.vietlearn.org\/post\/wp-content\/uploads\/2021\/12\/img_430-6.png\" alt=\"IMG_430\" \/> g\u1ecdi l\u00e0 c\u1ea1nh b\u00ean c\u1ee7a h\u00ecnh ch\u00f3p c\u1ee5t.<\/li>\n<\/ul>\n<p>T\u00f9y theo \u0111\u00e1y l\u00e0 tam gi\u00e1c, t\u1ee9 gi\u00e1c, ng\u0169 gi\u00e1c,\u2026 ta c\u00f3 h\u00ecnh ch\u00f3p c\u1ee5t tam gi\u00e1c, h\u00ecnh ch\u00f3p c\u1ee5t t\u1ee9 gi\u00e1c, h\u00ecnh ch\u1ee5p c\u1ee5t ng\u0169 gi\u00e1c,\u2026<\/p>\n<p><strong>T\u00ednh ch\u1ea5t:<\/strong> V\u1edbi h\u00ecnh ch\u00f3p c\u1ee5t, ta c\u00f3 c\u00e1c t\u00ednh ch\u1ea5t sau:<\/p>\n<p>1. Hai \u0111\u00e1y c\u1ee7a h\u00ecnh ch\u00f3p c\u1ee5t l\u00e0 hai \u0111a gi\u00e1c \u0111\u1ed3ng d\u1ea1ng.<\/p>\n<p>2. C\u00e1c m\u1eb7t b\u00ean c\u1ee7a h\u00ecnh ch\u00f3p c\u1ee5t l\u00e0 c\u00e1c h\u00ecnh thang.<\/p>\n<p>3. C\u00e1c c\u1ea1nh b\u00ean c\u1ee7a h\u00ecnh ch\u00f3p c\u1ee5t \u0111\u1ed3ng quy t\u1ea1i m\u1ed9t \u0111i\u1ec3m.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A \u2013 L\u00dd THUY\u1ebeT CHUNG I &#8211; \u0110\u1ea0I C\u01af\u01a0NG V\u1ec0 \u0110\u01af\u1edcNG TH\u1eb2NG V\u00c0 M\u1eb6T PH\u1eb2NG 1. M\u1edf \u0111\u1ea7u v\u1ec1 h\u00ecnh h\u1ecdc kh\u00f4ng gian H\u00ecnh h\u1ecdc kh\u00f4ng gian c\u00f3 c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng c\u01a1 b\u1ea3n l\u00e0 \u0111i\u1ec3m, \u0111\u01b0\u1eddng th\u1eb3ng v\u00e0 m\u1eb7t ph\u1eb3ng. Quan h\u1ec7 thu\u1ed9c: Trong kh\u00f4ng gian: V\u1edbi m\u1ed9t \u0111i\u1ec3m v\u00e0 m\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng c\u00f3 th\u1ec3 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_disable_autopaging":false},"categories":[42],"tags":[],"class_list":["post-21916","post","type-post","status-publish","format-standard","hentry","category-toan-lop-11"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/21916","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/comments?post=21916"}],"version-history":[{"count":1,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/21916\/revisions"}],"predecessor-version":[{"id":22092,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/21916\/revisions\/22092"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=21916"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=21916"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=21916"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}