{"id":7611,"date":"2021-11-20T14:09:00","date_gmt":"2021-11-20T07:09:00","guid":{"rendered":"https:\/\/www.vietlearn.org\/post\/?p=7611"},"modified":"2021-11-20T17:13:34","modified_gmt":"2021-11-20T10:13:34","slug":"trong-cac-khu-dan-cu-nguoi-ta-thuong-bo-tri-cac-bon-hoa-tham-co-lam-cho-khu-dan-cu-duoc-dep-de-vui-mat-the-cac-ban-co-biet-cach-thiet-ke-cac-kieu-bon-hoa-nay-khong","status":"publish","type":"post","link":"https:\/\/www.vietlearn.org\/kien-thuc\/trong-cac-khu-dan-cu-nguoi-ta-thuong-bo-tri-cac-bon-hoa-tham-co-lam-cho-khu-dan-cu-duoc-dep-de-vui-mat-the-cac-ban-co-biet-cach-thiet-ke-cac-kieu-bon-hoa-nay-khong\/","title":{"rendered":"Trong c\u00e1c khu d\u00e2n c\u01b0, ng\u01b0\u1eddi ta th\u01b0\u1eddng b\u1ed1 tr\u00ed c\u00e1c b\u1ed3n hoa, th\u1ea3m c\u1ecf l\u00e0m cho khu d\u00e2n c\u01b0 \u0111\u01b0\u1ee3c \u0111\u1eb9p \u0111\u1ebd, vui m\u1eaft. Th\u1ebf c\u00e1c b\u1ea1n c\u00f3 bi\u1ebft c\u00e1ch thi\u1ebft k\u1ebf c\u00e1c ki\u1ec3u b\u1ed3n hoa n\u00e0y kh\u00f4ng?"},"content":{"rendered":"\n

Th\u00e1ng 7- 1993, m\u1ed9t th\u1ea7y gi\u00e1o d\u1ea1y to\u00e1n l\u1edbp ba \u0111\u00e3 ra cho h\u1ecdc sinh<\/a> m\u1ed9t \u0111\u1ec1 to\u00e1n nh\u01b0 sau: C\u00f3 m\u1ed9t khu \u0111\u1ea5t h\u00ecnh ch\u1eef nh\u1eadt d\u00e0i 4 m, r\u1ed9ng 3 m, c\u1ea7n b\u1ed1 tr\u00ed tr\u00ean khu \u0111\u1ea5t m\u1ed9t s\u1ed1 b\u1ed3n hoa n\u00e0o \u0111\u1ec3 cho di\u1ec7n t\u00edch c\u00e1c b\u1ed3n hoa chi\u1ebfm n\u1eeda di\u1ec7n t\u00edch khu \u0111\u1ea5t? B\u1ea1n h\u00e3y \u0111\u01b0a ra c\u00e1c ph\u01b0\u01a1ng \u00e1n.<\/p>\n\n\n\n

C\u00e1c b\u1ea1n tr\u1ebb \u0111\u00e3 ph\u00e1t huy h\u1ebft kh\u1ea3 n\u0103ng v\u00e0 thi\u1ebft k\u1ebf<\/a>, nhi\u1ec1u \u0111\u1ed3 \u00e1n kh\u00f4ng ch\u1ec9 tr\u00f4ng r\u1ea5t \u0111\u1eb9p m\u00e0 c\u00f2n c\u00f3 th\u1ec3 t\u00ednh \u0111\u01b0\u1ee3c di\u1ec7n t\u00edch c\u00e1c b\u1ed3n hoa. C\u00e1c h\u00ecnh v\u1ebd \u1edf b\u00ean tr\u00ecnh b\u00e0y t\u00e1m lo\u1ea1i \u0111\u1ed3 \u00e1n. B\u1ea1n c\u00f3 th\u1ec3 thi\u1ebft k\u1ebf<\/a> c\u00e1c b\u1ed3n hoa \u0111\u1eb9p h\u01a1n kh\u00f4ng?<\/p>\n\n\n\n

\u0110\u1ed1i v\u1edbi t\u00e1m \u0111\u1ed3 \u00e1n n\u00eau tr\u00ean, \u0111\u1ec1u c\u00f3 th\u1ec3 d\u1ec5 d\u00e0ng t\u00ednh \u0111\u01b0\u1ee3c di\u1ec7n t\u00edch c\u00e1c b\u1ed3n hoa, khi x\u00e2y d\u1ef1ng c\u00f3 th\u1ec3 ch\u1ecdn \u0111\u01b0\u1ee3c ch\u1ed7 \u0111\u1ea5t v\u00e0 b\u1ed1 tr\u00ed tr\u00ean m\u1eb7t b\u1eb1ng. V\u00ed d\u1ee5 nh\u01b0 \u1edf h\u00ecnh 6 c\u1ea5u t\u1ea1o t\u1eeb m\u1ed9t h\u00ecnh tr\u00f2n v\u00e0 b\u1ed1n qu\u1ea1t tr\u00f2n, m\u1ed7i qu\u1ea1t tr\u00f2n \u0111\u00fang b\u1eb1ng 1\/4 di\u1ec7n t\u00edch h\u00ecnh tr\u00f2n, c\u00e1c qu\u1ea1t tr\u00f2n v\u00e0 h\u00ecnh tr\u00f2n c\u00f3 b\u00e1n k\u00ednh b\u1eb1ng nhau v\u00e0 b\u1eb1ng R. Ta d\u1ec5 d\u00e0ng t\u00ednh \u0111\u01b0\u1ee3c b\u00e1n k\u00ednh c\u1ee7a h\u00ecnh tr\u00f2n n\u00e0y. Theo y\u00eau c\u1ea7u c\u1ee7a \u0111\u1ed3 \u00e1n ta c\u00f3 ph\u01b0\u01a1ng tr\u00ecnh: 2(\u03c0R)2 = 1\/2.4.3, \u03c0R2 = 3,<\/p>\n\n\n\n

Nh\u01b0 v\u1eady ch\u1ec9 c\u1ea7n ch\u1ecdn v\u00f2ng tr\u00f2n c\u00f3 b\u00e1n k\u00ednh b\u1eb1ng 0,977 m th\u00ec c\u00e1c b\u1ed3n hoa th\u1ef1c hi\u1ec7n nh\u01b0 \u1edf \u0111\u1ed3 \u00e1n 6 s\u1ebd c\u00f3 di\u1ec7n t\u00edch b\u1eb1ng n\u1eeda di\u1ec7n t\u00edch c\u1ee7a khu \u0111\u1ea5t \u0111\u00e3ch\u1ecdn.<\/p>\n\n\n\n

Th\u00f4n n\u1ecd, m\u1ed9t khu \u0111\u1ea5t h\u00ecnh tam gi\u00e1c c\u00f3 m\u1ed9t c\u1ea1nh ti\u1ebfp gi\u00e1p v\u1edbi m\u1ed9t m\u01b0\u01a1ng n\u01b0\u1edbc nh\u01b0 \u1edf h\u00ecnh v\u1ebd. C\u00e1c nh\u00e0 ch\u1ee9c tr\u00e1ch trong th\u00f4n mu\u1ed1n chia khu \u0111\u1ea5t cho n\u0103m h\u1ed9 d\u00e2n c\u01b0. \u0110\u1ec3 vi\u1ec7c t\u01b0\u1edbi n\u01b0\u1edbc \u0111\u01b0\u1ee3c t\u1ed1t, m\u1ed7i khu \u0111\u1ea5t c\u1ee7a m\u1ed7i h\u1ed9 d\u00e2n c\u01b0 ph\u1ea3i n\u1ed1i v\u1edbi m\u01b0\u01a1ng n\u01b0\u1edbc. B\u1ea1n h\u00e3y c\u0103n c\u1ee9 theo s\u1ed1 nh\u00e2n kh\u1ea9u c\u1ee7a m\u1ed7i h\u1ed9 \u0111\u1ec3 vi\u1ec7c ph\u00e2n chia khu \u0111\u1ea5t nh\u01b0 th\u1ebf n\u00e0o th\u00ec t\u1ed1t. S\u1ed1 nh\u00e2n kh\u1ea9u trong m\u1ed7i h\u1ed9 d\u00e2n c\u01b0 \u0111\u01b0\u1ee3c li\u1ec7t k\u00ea trong b\u1ea3ng d\u01b0\u1edbi \u0111\u00e2y:<\/p>\n\n\n\n

Ta bi\u1ebft r\u1eb1ng di\u1ec7n t\u00edch h\u00ecnh tam gi\u00e1c b\u1eb1ng m\u1ed9t n\u1eeda t\u00edch s\u1ed1 c\u1ee7a \u0111\u00e1y nh\u00e2n v\u1edbi chi\u1ec1u cao. N\u1ebfu c\u00e1c h\u00ecnh tam gi\u00e1c c\u00f3 chi\u1ec1u cao b\u1eb1ng nhau th\u00ec di\u1ec7n t\u00edch tam gi\u00e1c s\u1ebd t\u1ec9 l\u1ec7 v\u1edbi \u0111\u1ed9 d\u00e0i c\u1ee7a \u0111\u00e1y tam gi\u00e1c. Gi\u1ea3 s\u1eed c\u00f3 2 h\u00ecnh tam gi\u00e1c A v\u00e0 B n\u1ebfu c\u1ea1nh \u0111\u00e1y c\u1ee7a A g\u1ea5p \u0111\u00f4i c\u1ea1nh \u0111\u00e1y c\u1ee7a B th\u00ec di\u1ec7n t\u00edch c\u1ee7a A g\u1ea5p \u0111\u00f4i di\u1ec7n t\u00edch c\u1ee7a B.<\/p>\n\n\n\n

T\u1ed5ng s\u1ed1 nh\u00e2n kh\u1ea9u c\u1ee7a n\u0103m h\u1ed9 d\u00e2n l\u00e0 25. C\u00e1c h\u1ed9 d\u00e2n \u0111\u1ec1u n\u1eb1m tr\u00ean AB l\u00e0 m\u01b0\u01a1ng n\u01b0\u1edbc. B\u1eaft \u0111\u1ea7u t\u1eeb A (ho\u1eb7c B) l\u1ea5y 300\/25 l\u00e0m \u0111\u01a1n v\u1ecb sau \u0111\u00f3 theo s\u1ed1 nh\u00e2n kh\u1ea9u nh\u00e2n v\u1edbi \u0111\u01a1n v\u1ecb v\u1eeba t\u00ednh \u0111\u01b0\u1ee3c l\u00e0 \u0111\u01b0\u1ee3c ph\u1ea7n \u0111\u1ea5t cho h\u1ed9 t\u01b0\u01a1ng \u1ee9ng.<\/p>\n\n\n\n

V\u00ed d\u1ee5 v\u1edbi h\u1ed9 s\u1ed1 1 ta l\u1ea5y n\u0103m \u0111\u01a1n v\u1ecb \u0111\u1ed9 d\u00e0i 12.5 = 60 m. T\u1eeb A \u0111\u1eb7t \u0111o\u1ea1n AA1 = 60 m, ta \u0111\u01b0\u1ee3c khu \u0111\u1ea5t gi\u1edbi h\u1ea1n cho h\u1ed9 s\u1ed1 1 l\u00e0 tam gi\u00e1c AA1C. N\u1ebfu c\u00e1c h\u1ed9 d\u00e2n c\u01b0 c\u1ea3m th\u1ea5y khu \u0111\u1ea5t h\u00ecnh tam gi\u00e1c kh\u00f4ng thu\u1eadn ti\u1ec7n cho vi\u1ec7c canh t\u00e1c c\u00f3 th\u1ec3 l\u1ef1a ch\u1ecdn nhi\u1ec1u ph\u01b0\u01a1ng \u00e1n ph\u00e2n chia kh\u00e1c theo quan \u0111i\u1ec3m n\u00e0o \u0111\u00f3 th\u00edch h\u1ee3p.<\/p>\n\n\n\n

T\u1eeb kho\u00e1: H\u00ecnh tam gi\u00e1c v\u00e0 di\u1ec7n t\u00edch tam gi\u00e1c.<\/p>\n\n\n\n

<\/p>\n\n\n\n\n\n\n","protected":false},"excerpt":{"rendered":"

Th\u00e1ng 7- 1993, m\u1ed9t th\u1ea7y gi\u00e1o d\u1ea1y to\u00e1n l\u1edbp ba \u0111\u00e3 ra cho h\u1ecdc sinh m\u1ed9t \u0111\u1ec1 to\u00e1n nh\u01b0 sau: C\u00f3 m\u1ed9t khu \u0111\u1ea5t h\u00ecnh ch\u1eef nh\u1eadt d\u00e0i 4 m, r\u1ed9ng 3 m, c\u1ea7n b\u1ed1 tr\u00ed tr\u00ean khu \u0111\u1ea5t m\u1ed9t s\u1ed1 b\u1ed3n hoa n\u00e0o \u0111\u1ec3 cho di\u1ec7n t\u00edch c\u00e1c b\u1ed3n hoa chi\u1ebfm n\u1eeda di\u1ec7n t\u00edch […]<\/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":[15,9],"tags":[],"class_list":["post-7611","post","type-post","status-publish","format-standard","hentry","category-hoi-dap-khoa-hoc","category-toan-hoc"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/7611","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=7611"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/7611\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=7611"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=7611"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=7611"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}