{"id":927,"date":"2021-10-07T23:43:42","date_gmt":"2021-10-07T23:43:42","guid":{"rendered":"https:\/\/www.vietlearn.org\/post\/?p=927"},"modified":"2021-10-14T22:11:36","modified_gmt":"2021-10-14T15:11:36","slug":"cac-truong-hop-dong-dang-cua-tam-giac-vuong-hoc-tot-toan-8","status":"publish","type":"post","link":"https:\/\/www.vietlearn.org\/kien-thuc\/cac-truong-hop-dong-dang-cua-tam-giac-vuong-hoc-tot-toan-8\/","title":{"rendered":"C\u00e1c tr\u01b0\u1eddng h\u1ee3p \u0111\u1ed3ng d\u1ea1ng c\u1ee7a tam gi\u00e1c vu\u00f4ng \u2013 H\u1ecdc t\u1ed1t to\u00e1n 8"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Ghi ch\u00fa: T\u00e0i li\u1ec7u tr\u00edch d\u1eabn<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B\u00e0i to\u00e1n h\u00ecnh h\u1ecdc v\u1ec1 tam gi\u00e1c \u0111\u1ed3ng d\u1ea1ng l\u00e0 m\u1ed9t ki\u1ebfn th\u1ee9c t\u01b0\u01a1ng \u0111\u1ed1i quan tr\u1ecdng, l\u00e0 d\u1ea1ng to\u00e1n c\u01a1 b\u1ea3n n\u1ec1n t\u1ea3ng cho nh\u1eefng ki\u1ebfn th\u1ee9c n\u00e2ng cao sau n\u00e0y. Kh\u00f4ng ch\u1ec9 xu\u1ea5t hi\u1ec7n trong c\u00e1c \u0111\u1ec1 thi ki\u1ec3m tra hay \u0111\u1ec1 thi h\u1ecdc k\u00ec m\u00e0 d\u1ea1ng to\u00e1n tam gi\u00e1c \u0111\u1ed3ng d\u1ea1ng c\u0169ng s\u1ebd l\u00e0 c\u00f4ng c\u1ee5 \u0111\u1ec3 ch\u1ee9ng minh, gi\u1ea3i quy\u1ebft nh\u1eefng b\u00e0i to\u00e1n \u1edf c\u1ea5p 3 ho\u1eb7c <a href=\"https:\/\/www.vietlearn.org\" data-internallinksmanager029f6b8e52c=\"2\" title=\"Vietlearn\" rel=\"nofollow\">\u00f4n thi \u0111\u1ea1i h\u1ecdc<\/a>. Trong c\u00e1c d\u1ea1ng to\u00e1n \u0111\u1ed3ng d\u1ea1ng, ph\u1ea3i k\u1ec3 t\u1edbi tr\u01b0\u1eddng h\u1ee3p \u0111\u1eb7c bi\u1ec7t l\u00e0 c\u00e1c tr\u01b0\u1eddng h\u1ee3p \u0111\u1ed3ng d\u1ea1ng c\u1ee7a tam gi\u00e1c vu\u00f4ng.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">H\u00f4m nay, Vietlearn s\u1ebd mang t\u1edbi cho b\u1ea1n nh\u1eefng ki\u1ebfn th\u1ee9c v\u1ec1 tam gi\u00e1c \u0111\u1ed3ng d\u1ea1ng v\u00e0 \u0111\u1eb7c bi\u1ec7t ch\u00fa tr\u1ecdng t\u1edbi \u0111\u1ed3ng d\u1ea1ng c\u1ee7a tam gi\u00e1c vu\u00f4ng b\u1eb1ng b\u00e0i vi\u1ebft d\u01b0\u1edbi \u0111\u00e2y.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u1ed3ng d\u1ea1ng l\u00e0 g\u00ec?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u1ec3 c\u00f3 th\u1ec3 hi\u1ec3u \u0111\u01b0\u1ee3c \u0111\u1ed3ng d\u1ea1ng c\u1ee7a hai tam gi\u00e1c b\u1ea5t k\u00ec n\u00e0o \u0111\u00f3, \u0111\u1ea7u ti\u00ean ch\u00fang ta c\u1ea7n n\u1eafm ch\u1eafc kh\u00e1i ni\u1ec7m v\u1ec1 \u0111\u1ed3ng d\u1ea1ng. V\u1eady \u0111\u1ed3ng d\u1ea1ng ngh\u0129a l\u00e0 g\u00ec?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u1ed3ng d\u1ea1ng l\u00e0 m\u1ed9t kh\u00e1i ni\u1ec7m thu\u1ed9c v\u1ec1 to\u00e1n h\u00ecnh h\u1ecdc, m\u00e0 \u0111\u1ed1i t\u01b0\u1ee3ng c\u1ee7a n\u00f3 l\u00e0 c\u00e1c h\u00ecnh h\u1ecdc c\u00f3 h\u00ecnh d\u1ea1ng v\u00e0 c\u1ea5u tr\u00fac gi\u1ed1ng nhau ho\u00e0n to\u00e0n ho\u1eb7c t\u1ec9 l\u1ec7 theo k\u00edch th\u01b0\u1edbc v\u1edbi nhau. N\u00f3i c\u00e1ch kh\u00e1c, \u0111\u1ed3ng d\u1ea1ng l\u00e0 k\u1ebft qu\u1ea3 c\u1ee7a ph\u00e9p bi\u1ebfn h\u00ecnh to\u00e1n h\u1ecdc. T\u1ea5t c\u1ea3 c\u00e1c d\u1ea1ng h\u00ecnh h\u1ecdc nh\u01b0 h\u00ecnh tr\u00f2n, vu\u00f4ng, tam gi\u00e1c, elip,\u2026 \u0111\u1ec1u c\u00f3 t\u00ednh ch\u1ea5t \u0111\u1ed3ng d\u1ea1ng.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">K\u00ed hi\u1ec7u c\u1ee7a ph\u00e9p \u0111\u1ed3ng d\u1ea1ng l\u00e0 \u1515 , c\u00f3 h\u00ecnh d\u1ea1ng nh\u01b0 d\u1ea5u ng\u00e3 ng\u01b0\u1ee3c hay ch\u1eef S n\u1eb1m ngang. N\u00ean k\u00ed hi\u1ec7u ch\u00ednh x\u00e1c v\u00e0 r\u00f5 r\u00e0ng \u0111\u1ec3 tr\u00e1nh nh\u1ea7m l\u1eabn.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">L\u00fd thuy\u1ebft v\u1ec1 tr\u01b0\u1eddng h\u1ee3p \u0111\u1ed3ng d\u1ea1ng c\u1ee7a tam gi\u00e1c c\u1ea7n nh\u1edb<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Tr\u01b0\u1edbc khi b\u01b0\u1edbc v\u00e0o t\u00ecm hi\u1ec3u v\u1ec1 c\u00e1c tr\u01b0\u1eddng h\u1ee3p \u0111\u1ed3ng d\u1ea1ng c\u1ee7a tam gi\u00e1c vu\u00f4ng, Vietlearn s\u1ebd gi\u00fap c\u00e1c b\u1ea1n h\u1ec7 th\u1ed1ng l\u1ea1i c\u00e1c ki\u1ebfn th\u1ee9c v\u1ec1 c\u00e1c tr\u01b0\u1eddng h\u1ee3p \u0111\u1ed3ng d\u1ea1ng c\u1ee7a tam gi\u00e1c b\u1ea5t k\u00ec. T\u1eeb \u0111\u00f3 l\u00e0m c\u01a1 s\u1edf \u0111\u1ec3 hi\u1ec3u \u0111\u01b0\u1ee3c ki\u1ebfn th\u1ee9c m\u1edbi d\u1ec5 d\u00e0ng h\u01a1n.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u1ec3 c\u00f3 th\u1ec3 ch\u1ee9ng minh v\u00e0 gi\u1ea3i quy\u1ebft c\u00e1c b\u00e0i to\u00e1n \u0111\u1ed3ng d\u1ea1ng, c\u00e1c b\u1ea1n <a href=\"https:\/\/www.vietlearn.org\" data-internallinksmanager029f6b8e52c=\"2\" title=\"Vietlearn\" rel=\"nofollow\">h\u1ecdc sinh<\/a> c\u1ea7n ghi nh\u1edb nh\u1eefng ki\u1ebfn th\u1ee9c v\u1ec1 t\u00ednh ch\u1ea5t c\u01a1 b\u1ea3n nh\u01b0 \u0111\u1ecbnh l\u00fd Ta-l\u00e9t,\u0111\u01b0\u1eddng ph\u00e2n gi\u00e1c, c\u00e1c tr\u01b0\u1eddng h\u1ee3p \u0111\u1ed3ng d\u1ea1ng ( c-c-c; c-g-c; g-g-g-).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u1ecbnh l\u00fd Ta-l\u00e9t trong tam gi\u00e1c<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u1ecbnh l\u00fd Ta-l\u00e9t thu\u1eadn: M\u1ed9t c\u1ea1nh c\u1ee7a tam gi\u00e1c song song v\u1edbi m\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng v\u00e0 c\u1eaft nhau b\u1edfi hai c\u1ea1nh c\u00f2n l\u1ea1i th\u00ec c\u00f3 chi\u1ec1u d\u00e0i c\u00e1c \u0111o\u1ea1n t\u1ec9 l\u1ec7 v\u1edbi nhau t\u01b0\u01a1ng \u1ee9ng.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u1ecbnh l\u00fd Ta-l\u00e9t \u0111\u1ea3o: N\u1ebfu hai c\u1ea1nh c\u1ee7a m\u1ed9t tam gi\u00e1c c\u1eaft m\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng song song v\u1edbi c\u1ea1nh c\u00f2n t\u1ea1i th\u00ec t\u1ea1o th\u00e0nh m\u1ed9t tam gi\u00e1c m\u1edbi t\u1ec9 l\u1ec7 v\u1edbi ba c\u1ea1nh c\u1ee7a tam gi\u00e1c c\u0169.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">H\u1ec7 qu\u1ea3 \u0111\u1ecbnh l\u00fd Ta-l\u00e9t: N\u1ebfu m\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng c\u1eaft hai c\u1ea1nh c\u1ee7a m\u1ed9t tam gi\u00e1c v\u00e0 song song v\u1edbi c\u1ea1nh c\u00f2n l\u1ea1i c\u1ee7a tam gi\u00e1c \u0111\u00f3 th\u00ec s\u1ebd t\u1ea1o th\u00e0nh m\u1ed9t tam gi\u00e1c m\u1edbi c\u00f3 c\u00e1c c\u1ea1nh t\u1ec9 l\u1ec7 v\u1edbi c\u00e1c c\u1ea1nh c\u1ee7a tam gi\u00e1c c\u0169.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">T\u00ednh ch\u1ea5t \u0111\u01b0\u1eddng ph\u00e2n gi\u00e1c trong m\u1ed9t tam gi\u00e1c<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Trong tam gi\u00e1c, m\u1ed9t \u0111\u01b0\u1eddng ph\u00e2n gi\u00e1c s\u1ebd chia g\u00f3c \u0111\u00f3 th\u00e0nh hai ph\u1ea7n t\u1ec9 l\u1ec7 thu\u1eadn v\u1edbi c\u00e1c \u0111o\u1ea1n c\u1ee7a c\u1ea1nh \u0111\u1ed1i di\u1ec7n.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Tam gi\u00e1c \u0111\u1ed3ng d\u1ea1ng<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Cho hai tam gi\u00e1c ABC v\u00e0 A\u2019B\u2019C\u2019<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C\u00e1c g\u00f3c v\u00e0 c\u1ea1nh hai tam gi\u00e1c<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Nh\u01b0 v\u1eady c\u00f3 th\u1ec3 n\u00f3i hai \u2206ABC v\u00e0 \u2206A\u2019B\u2019C\u2019 \u0111\u1ed3ng d\u1ea1ng v\u1edbi nhau v\u00e0 k \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 t\u1ec9 s\u1ed1 \u0111\u1ed3ng d\u1ea1ng khi<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Khi \u0111\u00e3 ch\u1ee9ng minh \u0111\u01b0\u1ee3c hai tam gi\u00e1c \u0111\u1ed3ng d\u1ea1ng, c\u00f3 2 t\u00ednh ch\u1ea5t sau:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">N\u1ebfu \u2206ABC v\u00e0 \u2206A\u2019B\u2019C\u2019 \u0111\u1ed3ng d\u1ea1ng v\u1edbi nhau th\u00ec \u2206A\u2019B\u2019C\u2019 v\u00e0 \u2206ABC c\u0169ng \u0111\u1ed3ng d\u1ea1ng v\u1edbi nhau.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">N\u1ebfu \u2206ABC v\u00e0 \u2206A\u201dB\u201dC\u201d \u0111\u1ed3ng d\u1ea1ng v\u1edbi nhau th\u00ec \u2206A\u2019B\u2019C\u2019 v\u00e0 \u2206A\u201dB\u201dC\u201d c\u0169ng \u0111\u1ed3ng d\u1ea1ng v\u1edbi nhau.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C\u00e1c tr\u01b0\u1eddng h\u1ee3p \u0111\u1ed3ng d\u1ea1ng c\u1ee7a tam gi\u00e1c<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Tr\u01b0\u1eddng h\u1ee3p c\u1ea1nh \u2013 c\u1ea1nh \u2013 c\u1ea1nh : C\u00e1c c\u1ea1nh c\u1ee7a tam gi\u00e1c n\u00e0y t\u1ec9 l\u1ec7 t\u01b0\u01a1ng \u1ee9ng v\u1edbi c\u00e1c c\u1ea1nh c\u1ee7a tam gi\u00e1c kh\u00e1c th\u00ec hai tam gi\u00e1c \u0111\u00f3 \u0111\u1ed3ng d\u1ea1ng<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Tr\u01b0\u1eddng h\u1ee3p c\u1ea1nh \u2013 g\u00f3c \u2013 c\u1ea1nh: Hai c\u1ea1nh c\u1ee7a m\u1ed9t tam gi\u00e1c n\u00e0y t\u1ec9 l\u1ec7 t\u01b0\u01a1ng \u1ee9ng v\u1edbi hai c\u1ea1nh c\u1ee7a tam gi\u00e1c kia v\u00e0 g\u00f3c t\u1ea1o b\u1edfi hai c\u1ea1nh \u0111\u00f3 b\u1eb1ng nhau th\u00ec s\u1ebd c\u00f3 hai tam gi\u00e1c \u0111\u1ed3ng d\u1ea1ng.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Tr\u01b0\u1eddng h\u1ee3p g\u00f3c \u2013 g\u00f3c \u2013 g\u00f3c : N\u1ebfu hai g\u00f3c c\u1ee7a tam gi\u00e1c n\u00e0y b\u1eb1ng v\u1edbi hai g\u00f3c c\u1ee7a tam gi\u00e1c kh\u00e1c th\u00ec hai tam gi\u00e1c \u0111\u00f3 \u0111\u1ed3ng d\u1ea1ng ( b\u1edfi t\u1ed5ng ba g\u00f3c c\u1ee7a tam gi\u00e1c lu\u00f4n b\u1eb1ng 180o n\u00ean ch\u1ec9 c\u1ea7n ch\u1ee9ng minh hai g\u00f3c c\u1ee7a hai tam gi\u00e1c b\u1eb1ng nhau l\u00e0 \u0111\u1ee7).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">L\u00fd thuy\u1ebft c\u00e1c tr\u01b0\u1eddng h\u1ee3p \u0111\u1ed3ng d\u1ea1ng c\u1ee7a tam gi\u00e1c vu\u00f4ng<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">T\u1eeb c\u00e1c l\u00fd thuy\u1ebft c\u1ee7a hai tam gi\u00e1c \u0111\u1ed3ng d\u1ea1ng b\u1ea5t k\u1ef3, c\u00e1c b\u1ea1n <a href=\"https:\/\/www.vietlearn.org\" data-internallinksmanager029f6b8e52c=\"2\" title=\"Vietlearn\" rel=\"nofollow\">h\u1ecdc sinh<\/a> c\u00f3 th\u1ec3 suy ra c\u00e1c \u0111i\u1ec1u ki\u1ec7n c\u1ee7a hai tam gi\u00e1c vu\u00f4ng \u0111\u1ed3ng d\u1ea1ng. V\u00ec th\u1ef1c ch\u1ea5t tam gi\u00e1c vu\u00f4ng c\u0169ng ch\u1ec9 l\u00e0 m\u1ed9t tr\u01b0\u1eddng h\u1ee3p \u0111\u1eb7c bi\u1ec7t c\u1ee7a tam gi\u00e1c.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C\u00e1c tr\u01b0\u1eddng h\u1ee3p \u0111\u1ed3ng d\u1ea1ng c\u1ee7a tam gi\u00e1c vu\u00f4ng<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Tam gi\u00e1c vu\u00f4ng c\u00f3 g\u00f3c nh\u1ecdn b\u1eb1ng v\u1edbi g\u00f3c nh\u1ecdn c\u1ee7a m\u1ed9t tam gi\u00e1c vu\u00f4ng kh\u00e1c th\u00ec hai tam gi\u00e1c \u0111\u1ed3ng d\u1ea1ng ( theo tr\u01b0\u1eddng h\u1ee3p g \u2013 g \u2013 g c\u1ee7a tam gi\u00e1c th\u01b0\u1eddng, khi tam gi\u00e1c vu\u00f4ng c\u00f3 m\u1ed9t g\u00f3c nh\u1ecdn b\u1eb1ng nhau v\u00e0 g\u00f3c vu\u00f4ng lu\u00f4n b\u1eb1ng nhau th\u00ec s\u1ebd c\u00f3 g\u00f3c c\u00f2n l\u1ea1i b\u1eaft bu\u1ed9c b\u1eb1ng nhau v\u00ec t\u1ed5ng c\u00e1c g\u00f3c trong tam gi\u00e1c l\u00e0 180o)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Hai c\u1ea1nh t\u1ea1o n\u00ean g\u00f3c vu\u00f4ng n\u00e0y t\u1ec9 l\u1ec7 t\u01b0\u01a1ng \u1ee9ng v\u1edbi hai c\u1ea1nh t\u1ea1o n\u00ean g\u00f3c vu\u00f4ng c\u1ee7a tam gi\u00e1c kh\u00e1c th\u00ec hai tam gi\u00e1c \u0111\u00f3 \u0111\u1ed3ng d\u1ea1ng v\u1edbi nhau.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p> Kh\u00e1i ni\u1ec7m hai tam gi\u00e1c \u0111\u1ed3ng d\u1ea1ng<\/p><\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">C\u00e1c d\u1ea5u hi\u1ec7u nh\u1eadn bi\u1ebft c\u00e1c tr\u01b0\u1eddng h\u1ee3p \u0111\u1ed3ng d\u1ea1ng c\u1ee7a tam gi\u00e1c vu\u00f4ng<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u1ecbnh l\u00fd 1: v\u1ec1 c\u1ea1nh huy\u1ec1n v\u00e0 c\u1ea1nh g\u00f3c vu\u00f4ng<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u1ecbnh l\u00fd 1<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u1ecbnh l\u00fd 2 : T\u1ec9 s\u1ed1 \u0111\u01b0\u1eddng cao c\u1ee7a hai tam gi\u00e1c<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ch\u1ee9ng minh \u0111\u1ecbnh l\u00fd 2<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u1ecbnh l\u00fd 3: T\u1ec9 s\u1ed1 v\u1ec1 di\u1ec7n t\u00edch hai tam gi\u00e1c<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u1ecbnh l\u00fd 3<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Trong \u0111\u1ecbnh l\u00fd 3, c\u00e1c b\u1ea1n <a href=\"https:\/\/www.vietlearn.org\" data-internallinksmanager029f6b8e52c=\"2\" title=\"Vietlearn\" rel=\"nofollow\">h\u1ecdc sinh<\/a> c\u00f3 th\u1ec3 v\u1eadn d\u1ee5ng c\u00e1c ki\u1ebfn th\u1ee9c \u0111\u00e3 h\u1ecdc tr\u01b0\u1edbc \u0111\u00f3 \u0111\u1ec3 c\u00f3 th\u1ec3 ch\u1ee9ng minh \u0111\u1ecbnh l\u00fd v\u00e0 \u0111\u01b0a v\u00e0o \u00e1p d\u1ee5ng \u1edf c\u00e1c b\u00e0i t\u1eadp v\u1ec1 c\u00e1c tr\u01b0\u1eddng h\u1ee3p \u0111\u1ed3ng d\u1ea1ng c\u1ee7a tam gi\u00e1c vu\u00f4ng sau n\u00e0y.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">M\u1ed9t s\u1ed1 d\u1ea1ng b\u00e0i t\u1eadp v\u1ec1 c\u00e1c tr\u01b0\u1eddng h\u1ee3p \u0111\u1ed3ng d\u1ea1ng c\u1ee7a tam gi\u00e1c vu\u00f4ng<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u1ec3 c\u00f3 th\u1ec3 gi\u1ea3i c\u00e1c b\u00e0i to\u00e1n m\u1ed9t c\u00e1ch d\u1ec5 d\u00e0ng, ng\u01b0\u1eddi ta chia th\u00e0nh c\u00e1c d\u1ea1ng to\u00e1n nh\u1ecf \u0111\u1ec3 c\u00f3 ph\u01b0\u01a1ng ph\u00e1p l\u00e0m ri\u00eang.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D\u1ea1ng 1: S\u1eed d\u1ee5ng t\u00ednh ch\u1ea5t tam gi\u00e1c \u0111\u1ed3ng d\u1ea1ng \u0111\u1ec3 t\u00ednh to\u00e1n<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ch\u1ee9ng minh hai tam gi\u00e1c \u0111\u1ed3ng d\u1ea1ng<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Suy ra c\u00e1c t\u1ec9 l\u1ec7 c\u1ea1nh, chi\u1ec1u cao, di\u1ec7n t\u00edch c\u1ea7n thi\u1ebft cho b\u00e0i to\u00e1n<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">T\u00ednh theo y\u00eau c\u1ea7u \u0111\u1ec1 b\u00e0i<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">D\u1ea1ng 2: Ch\u1ee9ng h\u1ec7 th\u1ee9c t\u1eeb c\u00e1c d\u1eef li\u1ec7u cho s\u1eb5n \u2013 C\u00e1c tr\u01b0\u1eddng h\u1ee3p \u0111\u1ed3ng d\u1ea1ng c\u1ee7a tam gi\u00e1c vu\u00f4ng<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u1ecdc \u0111\u1ec1 b\u00e0i v\u00e0 li\u00ean k\u1ebft c\u00e1c y\u1ebfu t\u1ed1 c\u00f3 li\u00ean quan t\u1edbi t\u00ednh ch\u1ea5t \u0111\u1ec3 \u00e1p d\u1ee5ng<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ch\u1ee9ng minh tam gi\u00e1c \u0111\u1ed3ng d\u1ea1ng v\u00e0 suy ra h\u1ec7 th\u1ee9c c\u1ea7n ch\u1ee9ng minh<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Tr\u00ean b\u00e0i vi\u1ebft n\u00e0y, Vietlearn \u0111\u00e3 t\u1ed5ng k\u1ebft cho c\u00e1c b\u1ea1n c\u00e1c <a href=\"https:\/\/www.vietlearn.org\" data-internallinksmanager029f6b8e52c=\"2\" title=\"Vietlearn\" rel=\"nofollow\">ki\u1ebfn th\u1ee9c c\u01a1 b\u1ea3n<\/a> li\u00ean quan t\u1edbi c\u00e1c tr\u01b0\u1eddng h\u1ee3p \u0111\u1ed3ng d\u1ea1ng c\u1ee7a tam gi\u00e1c vu\u00f4ng v\u00e0 ph\u01b0\u01a1ng ph\u00e1p cho c\u00e1c b\u00e0i to\u00e1n th\u01b0\u1eddng g\u1eb7p. Hy v\u1ecdng Vietlearn \u0111\u00e3 gi\u00fap cho c\u00e1c b\u1ea1n l\u00e0m b\u00e0i t\u1eadp d\u1ec5 d\u00e0ng h\u01a1n v\u00e0 c\u00f3 h\u1ee9ng th\u00fa h\u01a1n v\u1edbi m\u00f4n to\u00e1n h\u00ecnh h\u1ecdc 8. Ch\u00fac c\u00e1c b\u1ea1n h\u1ecdc h\u00e0nh th\u1eadt t\u1ed1t!<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">T\u00ecm hi\u1ec3u th\u00eam:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">H\u00ecnh h\u1ed9p ch\u1eef n<\/p>\n\n\n\n\n\n\n","protected":false},"excerpt":{"rendered":"<p>Ghi ch\u00fa: T\u00e0i li\u1ec7u tr\u00edch d\u1eabn B\u00e0i to\u00e1n h\u00ecnh h\u1ecdc v\u1ec1 tam gi\u00e1c \u0111\u1ed3ng d\u1ea1ng l\u00e0 m\u1ed9t ki\u1ebfn th\u1ee9c t\u01b0\u01a1ng \u0111\u1ed1i quan tr\u1ecdng, l\u00e0 d\u1ea1ng to\u00e1n c\u01a1 b\u1ea3n n\u1ec1n t\u1ea3ng cho nh\u1eefng ki\u1ebfn th\u1ee9c n\u00e2ng cao sau n\u00e0y. Kh\u00f4ng ch\u1ec9 xu\u1ea5t hi\u1ec7n trong c\u00e1c \u0111\u1ec1 thi ki\u1ec3m tra hay \u0111\u1ec1 thi h\u1ecdc k\u00ec m\u00e0 d\u1ea1ng [&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":[9,4],"tags":[],"class_list":["post-927","post","type-post","status-publish","format-standard","hentry","category-toan-hoc","category-trung-hoc"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/927","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=927"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/927\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=927"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=927"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=927"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}