{"id":298991,"date":"2023-12-22T20:40:38","date_gmt":"2023-12-22T13:40:38","guid":{"rendered":"https:\/\/hoanghamobile.com\/tin-tuc\/?p=298991"},"modified":"2023-12-22T20:40:38","modified_gmt":"2023-12-22T13:40:38","slug":"chu-vi-hinh-tron","status":"publish","type":"post","link":"https:\/\/hoanghamobile.com\/tin-tuc\/chu-vi-hinh-tron\/","title":{"rendered":"Chu vi h\u00ecnh tr\u00f2n l\u00e0 g\u00ec? C\u00f4ng th\u1ee9c v\u00e0 b\u00e0i t\u1eadp v\u1eadn d\u1ee5ng \u0111\u1ea7y \u0111\u1ee7 nh\u1ea5t"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">Ph\u01b0\u01a1ng ph\u00e1p t\u00ednh to\u00e1n chu vi h\u00ecnh tr\u00f2n hi\u1ec7n nay kh\u00e1 \u0111\u01a1n gi\u1ea3n. C\u00e1c em h\u1ecdc sinh ch\u1ec9 c\u1ea7n n\u1eafm ch\u00ednh x\u00e1c c\u00f4ng th\u1ee9c t\u00ednh chu vi l\u00e0 c\u00f3 th\u1ec3 gi\u1ea3i \u0111\u01b0\u1ee3c nh\u1eefng b\u00e0i t\u1eadp h\u00ecnh h\u1ecdc nhanh ch\u00f3ng. B\u00e0i vi\u1ebft sau s\u1ebd n\u00eau r\u00f5 h\u01a1n v\u1ec1 c\u00f4ng th\u1ee9c t\u00ednh chu vi c\u1ee7a h\u00ecnh tr\u00f2n v\u00e0 b\u00e0i t\u1eadp v\u1eadn d\u1ee5ng chi ti\u1ebft.<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">\u0110\u01b0\u1eddng tr\u00f2n l\u00e0 g\u00ec? H\u00ecnh tr\u00f2n l\u00e0 g\u00ec?<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Tr\u01b0\u1edbc khi t\u00ecm hi\u1ec3u v\u1ec1 chu vi h\u00ecnh tr\u00f2n th\u00ec m\u1ecdi ng\u01b0\u1eddi c\u1ea7n ph\u00e2n bi\u1ec7t r\u00f5 h\u00ecnh tr\u00f2n v\u00e0 \u0111\u01b0\u1eddng tr\u00f2n. Trong kh\u00e1i ni\u1ec7m h\u00ecnh h\u1ecdc th\u00ec h\u00ecnh trong v\u00e0 \u0111\u01b0\u1eddng tr\u00f2n l\u00e0 hai \u0111\u1ecbnh ngh\u0129a kh\u00e1c nhau. C\u1ee5 th\u1ec3:<\/span><\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"size-full wp-image-298996 aligncenter\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/chu-vi-hinh-tron-1.jpg\" alt=\"chu-vi-hinh-tron-1\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/chu-vi-hinh-tron-1.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/chu-vi-hinh-tron-1-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/chu-vi-hinh-tron-1-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">H\u00ecnh tr\u00f2n bao g\u1ed3m t\u1eadp h\u1ee3p to\u00e0n b\u1ed9 c\u00e1c \u0111i\u1ec3m n\u1eb1m \u1edf b\u00ean tr\u00ean v\u00e0 b\u00ean trong c\u1ee7a \u0111\u01b0\u1eddng tr\u00f2n. N\u00f3i \u0111\u01a1n gi\u1ea3n h\u01a1n th\u00ec h\u00ecnh tr\u00f2n ch\u1ee9a t\u1ea5t c\u1ea3 nh\u1eefng \u0111i\u1ec3m m\u00e0 c\u00e1ch t\u00e2m h\u00ecnh tr\u00f2n m\u1ed9t \u0111o\u1ea1n b\u1eb1ng ho\u1eb7c nh\u1ecf h\u01a1n b\u00e1n k\u00ednh.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">C\u00f2n \u0111\u01b0\u1eddng tr\u00f2n \u0111\u01b0\u1ee3c coi l\u00e0 qu\u1ef9 t\u00edch c\u1ee7a to\u00e0n b\u1ed9 nh\u1eefng \u0111i\u1ec3m \u1edf trong 1 m\u1eb7t ph\u1eb3ng, n\u00f3 c\u00e1ch \u0111\u1ec1u 1 \u0111i\u1ec3m \u0111\u00e3 cho s\u1eb5n (t\u00e2m) 1 \u0111o\u1ea1n b\u1eb1ng v\u1edbi b\u00e1n k\u00ednh c\u1ee7a \u0111\u01b0\u1eddng tr\u00f2n. B\u00ean c\u1ea1nh \u0111\u00f3, \u0111\u01b0\u1eddng tr\u00f2n s\u1ebd kh\u00f4ng c\u00f3 \u0111\u01b0\u1ee3c di\u1ec7n t\u00edch gi\u1ed1ng h\u00ecnh tr\u00f2n.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">\u0110\u01b0\u1eddng tr\u00f2n b\u00e1n k\u00ednh R, t\u00e2m O g\u1ed3m to\u00e0n b\u1ed9 nh\u1eefng \u0111i\u1ec3m n\u1eb1m c\u00e1ch xa t\u00e2m O m\u1ed9t \u0111o\u1ea1n b\u1eb1ng v\u1edbi b\u00e1n k\u00ednh R. B\u1ea5t c\u1ee9 \u0111i\u1ec3m n\u00e0o \u0111\u00f3 \u1edf tr\u00ean \u0111\u01b0\u1eddng tr\u00f2n v\u00e0 c\u00f3 th\u1ec3 n\u1ed1i th\u1eb3ng t\u1edbi t\u00e2m O th\u00ec n\u00f3 \u0111\u01b0\u1ee3c coi nh\u01b0 b\u00e1n k\u00ednh.\u00a0<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">C\u00f3 ba v\u1ecb tr\u00ed c\u1ee7a 1 \u0111i\u1ec3m ng\u1eabu nhi\u00ean v\u1edbi \u0111\u01b0\u1eddng tr\u00f2n<\/span><\/h3>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">N\u1ebfu nh\u01b0 \u0111i\u1ec3m A c\u00f3 v\u1ecb tr\u00ed b\u00ean trong c\u1ee7a \u0111\u01b0\u1eddng tr\u00f2n c\u00f3 t\u00e2m O, b\u00e1n k\u00ednh l\u00e0 R th\u00ec \u0111o\u1ea1n th\u1eb3ng OA l\u1edbn h\u01a1n R.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">N\u1ebfu nh\u01b0 \u0111i\u1ec3m A c\u00f3 v\u1ecb tr\u00ed \u1edf b\u00ean tr\u00ean c\u1ee7a \u0111\u01b0\u1eddng tr\u00f2n c\u00f3 t\u00e2m O, b\u00e1n k\u00ednh l\u00e0 R th\u00ec \u0111o\u1ea1n th\u1eb3ng OA s\u1ebd b\u1eb1ng R.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">N\u1ebfu nh\u01b0 \u0111i\u1ec3m A c\u00f3 v\u1ecb tr\u00ed \u1edf b\u00ean ngo\u00e0i c\u1ee7a \u0111\u01b0\u1eddng tr\u00f2n c\u00f3 t\u00e2m O, b\u00e1n k\u00ednh l\u00e0 R th\u00ec \u0111o\u1ea1n th\u1eb3ng OA s\u1ebd l\u1edbn h\u01a1n R.<\/span><\/li>\n<\/ul>\n<h3><span style=\"font-weight: 400;\">M\u1ed9t s\u1ed1 t\u00ednh ch\u1ea5t li\u00ean quan \u0111\u1ebfn \u0111\u01b0\u1eddng tr\u00f2n<\/span><\/h3>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Nh\u1eefng \u0111\u01b0\u1eddng tr\u00f2n gi\u1ed1ng nhau th\u01b0\u1eddng c\u00f3 chu vi nh\u01b0 nhau.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">\u0110\u01b0\u1eddng tr\u00f2n ch\u00ednh l\u00e0 \u0111o\u1ea1n th\u1eb3ng c\u00f3 \u0111\u1ed9 d\u00e0i d\u00e0i nh\u1ea5t n\u1eb1m b\u00ean trong c\u1ee7a h\u00ecnh tr\u00f2n.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">G\u00f3c t\u1ea1i t\u00e2m \u0111\u01b0\u1eddng tr\u00f2n l\u00e0 360 \u0111\u1ed9.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Chu vi \u1edf t\u1eebng \u0111\u01b0\u1eddng tr\u00f2n lu\u00f4n kh\u00e1c nhau.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">2 \u0111i\u1ec3m ti\u1ebfp tuy\u1ebfn \u0111\u01b0\u1ee3c v\u1ebd tr\u00ean c\u00f9ng m\u1ed9t \u0111\u01b0\u1eddng tr\u00f2n t\u1eeb m\u1ed9t \u0111i\u1ec3m \u1edf ngo\u00e0i \u0111\u01b0\u1eddng tr\u00f2n th\u00ec n\u00f3 c\u00f3 chi\u1ec1u d\u00e0i nh\u01b0 nhau.<\/span><\/li>\n<\/ul>\n<h3><span style=\"font-weight: 400;\">M\u1ed9t s\u1ed1 t\u00ednh ch\u1ea5t li\u00ean quan \u0111\u1ebfn h\u00ecnh tr\u00f2n<\/span><\/h3>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">\u0110\u01b0\u1eddng k\u00ednh c\u1ee7a h\u00ecnh tr\u00f2n l\u00e0 m\u1ed9t tr\u01b0\u1eddng h\u1ee3p m\u00e0 d\u00e2y cung n\u00f3 \u0111i qua \u0111i\u1ec3m t\u00e2m c\u1ee7a \u0111\u01b0\u1eddng tr\u00f2n. N\u00f3 ch\u00ednh l\u00e0 \u0111o\u1ea1n th\u1eb3ng c\u00f3 \u0111\u1ed9 d\u00e0i d\u00e0i nh\u1ea5t \u0111\u01b0\u1ee3c \u0111i qua h\u00ecnh tr\u00f2n, chia h\u00ecnh n\u00e0y th\u00e0nh 2 n\u1eeda ngang nhau.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">\u0110\u1ed9 d\u00e0i c\u1ee7a \u0111\u01b0\u1eddng k\u00ednh \u0111\u01b0\u1eddng tr\u00f2n s\u1ebd c\u00f3 \u0111\u1ed9 d\u00e0i h\u01a1n g\u1ea5p hai l\u1ea7n \u0111\u1ed9 d\u00e0i b\u00e1n k\u00ednh \u0111\u01b0\u1eddng tr\u00f2n \u0111\u00f3. C\u00f2n b\u00e1n k\u00ednh h\u00ecnh tr\u00f2n ch\u00ednh l\u00e0 kho\u1ea3ng c\u00e1ch xu\u1ea5t ph\u00e1t t\u1eeb t\u00e2m c\u1ee7a h\u00ecnh tr\u00f2n t\u1edbi \u0111\u01b0\u1eddng tr\u00f2n.<\/span><\/li>\n<\/ul>\n<h2><span style=\"font-weight: 400;\">Chu vi h\u00ecnh tr\u00f2n l\u00e0 g\u00ec? C\u00f4ng th\u1ee9c t\u00ednh chu vi?<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Chu vi c\u1ee7a h\u00ecnh tr\u00f2n l\u00e0 \u0111\u01b0\u1eddng bi\u00ean gi\u1edbi h\u1ea1n thu\u1ed9c h\u00ecnh tr\u00f2n. C\u00f4ng th\u1ee9c d\u00f9ng \u0111\u1ec3 t\u00ednh to\u00e1n chu vi l\u00e0 l\u1ea5y hai l\u1ea7n \u0111\u1ed9 d\u00e0i c\u1ee7a b\u00e1n k\u00ednh \u0111em nh\u00e2n v\u1edbi Pi hay l\u1ea5y \u0111\u01b0\u1eddng k\u00ednh c\u1ee7a h\u00ecnh tr\u00f2n \u0111em nh\u00e2n v\u1edbi Pi. Sau \u0111\u00e2y l\u00e0 c\u00f4ng th\u1ee9c c\u1ee5 th\u1ec3:<\/span><\/p>\n<p><span style=\"font-weight: 400;\">C = D x \u03c0\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Ho\u1eb7c C = (R x 2) x \u03c0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Trong \u0111\u00f3: C = Chu vi h\u00ecnh tr\u00f2n<\/span><\/p>\n<p><span style=\"font-weight: 400;\">R = B\u00e1n k\u00ednh\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">D = \u0110\u01b0\u1eddng k\u00ednh\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u03c0 = 3,14<\/span><\/p>\n<p><img decoding=\"async\" class=\"size-full wp-image-298997 aligncenter\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/chu-vi-hinh-tron-2.jpg\" alt=\"chu-vi-hinh-tron-2\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/chu-vi-hinh-tron-2.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/chu-vi-hinh-tron-2-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/chu-vi-hinh-tron-2-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h3><span style=\"font-weight: 400;\">Quan h\u1ec7 c\u1ee7a s\u1ed1 \u03c0 trong c\u00f4ng th\u1ee9c t\u00ednh chu vi c\u1ee7a h\u00ecnh tr\u00f2n<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">\u1ede c\u00f4ng th\u1ee9c tr\u00ean th\u00ec m\u1ecdi ng\u01b0\u1eddi c\u00f3 th\u1ea5y s\u1ef1 xu\u1ea5t hi\u1ec7n c\u1ee7a s\u1ed1 \u03c0 (Pi). \u0110\u00e2y l\u00e0 h\u1eb1ng s\u1ed1 \u0111\u00e3 \u0111\u01b0\u1ee3c l\u00e0m tr\u00f2n nh\u1eb1m l\u00e0m vi\u1ec7c t\u00ednh chu vi tr\u1edf n\u00ean \u0111\u01a1n gi\u1ea3n h\u01a1n. Trong c\u00f4ng th\u1ee9c t\u00ednh chu vi, \u03c0 \u0111\u01b0\u1ee3c coi l\u00e0 t\u1ef7 l\u1ec7 c\u1ee7a C (chu vi h\u00ecnh tr\u00f2n). B\u00ean c\u1ea1nh \u0111\u00f3, gi\u00e1 tr\u1ecb th\u1ef1c c\u1ee7a \u03c0 kh\u00e1 l\u00e0 d\u00e0i n\u00ean c\u00f4ng th\u1ee9c t\u00ednh chu vi m\u1edbi l\u01b0\u1ee3c b\u1ecf b\u1edbt v\u00e0 \u0111\u1ec3 cho d nh\u00e2n v\u1edbi 3,14.<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">C\u00e1ch t\u00ecm \u0111\u01b0\u1eddng k\u00ednh c\u1ee7a h\u00ecnh tr\u00f2n<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Trong c\u00f4ng th\u1ee9c t\u00ednh chu vi \u1edf tr\u00ean th\u00ec ch\u00fang ta c\u00f3 th\u1ea5y s\u1ef1 xu\u1ea5t hi\u1ec7n c\u1ee7a \u0111\u01b0\u1eddng k\u00ednh (D) trong h\u00ecnh tr\u00f2n. \u0110\u01b0\u1eddng k\u00ednh ch\u00ednh l\u00e0 \u0111o\u1ea1n th\u1eb3ng c\u00f3 th\u1ec3 \u0111i qua \u0111i\u1ec3m t\u00e2m c\u1ee7a h\u00ecnh tr\u00f2n. N\u00f3 s\u1ebd c\u1eaft v\u1edbi \u0111\u01b0\u1eddng tr\u00f2n ngay 2 \u0111i\u1ec3m n\u1eb1m tr\u00ean \u0111\u01b0\u1eddng tr\u00f2n.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u0110\u1ec3 t\u00ecm \u0111\u01b0\u1ee3c \u0111\u1ed9 d\u00e0i \u0111\u01b0\u1eddng k\u00ednh th\u00ec ch\u00fang ta s\u1ebd d\u1ef1a v\u00e0o chu vi, b\u00e1n k\u00ednh ho\u1eb7c di\u1ec7n t\u00edch h\u00ecnh tr\u00f2n nh\u01b0 sau:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">N\u1ebfu bi\u1ebft \u0111\u01b0\u1ee3c \u0111\u1ed9 d\u00e0i b\u00e1n k\u00ednh th\u00ec \u0111\u01b0\u1eddng k\u00ednh s\u1ebd g\u1ea5p 2 l\u1ea7n b\u00e1n k\u00ednh: D = 2R<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">N\u1ebfu \u0111\u00e3 bi\u1ebft \u0111\u01b0\u1ee3c chu vi th\u00ec \u0111\u01b0\u1eddng k\u00ednh c\u1ee7a h\u00ecnh tr\u00f2n s\u1ebd l\u00e0:\u00a0 D = C\/ \u03c0<\/span><\/li>\n<\/ul>\n<h2><span style=\"font-weight: 400;\">D\u1ea1ng to\u00e1n v\u00e0 b\u00e0i t\u1eadp v\u1eadn d\u1ee5ng c\u00f4ng th\u1ee9c t\u00ednh chu vi h\u00ecnh tr\u00f2n<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Sau khi \u0111\u00e3 t\u00ecm hi\u1ec3u c\u00f4ng th\u1ee9c t\u00ednh chu vi \u1edf tr\u00ean th\u00ec c\u00e1c b\u1ea1n c\u00f3 th\u1ec3 t\u00ecm hi\u1ec3u m\u1ed9t s\u1ed1 d\u1ea1ng to\u00e1n v\u00e0 b\u00e0i t\u1eadp li\u00ean quan t\u1edbi c\u00f4ng th\u1ee9c t\u00ednh chu vi c\u1ee7a h\u00ecnh tr\u00f2n nh\u01b0 sau:<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">D\u1ea1ng to\u00e1n cho \u0111\u01b0\u1eddng k\u00ednh, b\u00e1n k\u00ednh v\u00e0 t\u00ednh chu vi\u00a0<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">D\u1ea1ng to\u00e1n n\u00e0y th\u00ec b\u1ea1n c\u00f3 th\u1ec3 t\u00ednh to\u00e1n chu vi b\u1eb1ng vi\u1ec7c l\u1ea5y \u0111\u1ed9 d\u00e0i \u0111\u01b0\u1eddng k\u00ednh \u0111em nh\u00e2n v\u1edbi 3,14 ho\u1eb7c b\u1ea1n c\u00f3 th\u1ec3 l\u1ea5y hai l\u1ea7n \u0111\u1ed9 d\u00e0i b\u00e1n k\u00ednh \u0111em nh\u00e2n v\u1edbi 3,14 \u0111\u1ec3 t\u00ednh chu vi.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">B\u00e0i t\u1eadp 1: M\u1ed9t h\u00ecnh tr\u00f2n c\u00f3 \u0111\u1ed9 d\u00e0i b\u00e1n k\u00ednh l\u00e0 5cm. T\u00ednh chu vi?<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u0110\u00e1p \u00e1n:<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Chu vi c\u1ee7a h\u00ecnh tr\u00f2n n\u00e0y l\u00e0: 5 x 2 x 3,14\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">= 31,4 cm<\/span><\/p>\n<p><span style=\"font-weight: 400;\">B\u00e0i t\u1eadp 2: M\u1ed9t h\u00ecnh tr\u00f2n c\u00f3 \u0111\u1ed9 d\u00e0i \u0111\u01b0\u1eddng k\u00ednh l\u00e0 14dm. T\u00ednh chu vi?<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u0110\u00e1p \u00e1n:<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Chu vi l\u00e0: 14 x 3,14\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">= 43,96 dm<\/span><\/p>\n<p><span style=\"font-weight: 400;\">B\u00e0i t\u1eadp 3: M\u1ed9t h\u00ecnh tr\u00f2n c\u00f3 \u0111\u1ed9 d\u00e0i b\u00e1n k\u00ednh l\u00e0 9m. T\u00ednh chu vi?<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u0110\u00e1p \u00e1n:\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Chu vi = 9 x 2 x 3,14\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">= 56,52 m\u00a0<\/span><\/p>\n<p><img decoding=\"async\" class=\"size-full wp-image-298998 aligncenter\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/chu-vi-hinh-tron-3.jpg\" alt=\"chu-vi-hinh-tron-3\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/chu-vi-hinh-tron-3.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/chu-vi-hinh-tron-3-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/chu-vi-hinh-tron-3-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">B\u00e0i t\u1eadp 4: 1 h\u00ecnh tr\u00f2n s\u1edf h\u1eefu di\u1ec7n t\u00edch l\u00e0 0,785 dm2. H\u00e3y t\u00ednh chu vi?<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u0110\u00e1p \u00e1n:<\/span><\/p>\n<p><span style=\"font-weight: 400;\">2R = 0,785\/ 3,14\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">= 0,25 dm (t\u00edch hai l\u1ea7n b\u00e1n k\u00ednh c\u1ee7a h\u00ecnh tr\u00f2n)<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u2192 B\u00e1n k\u00ednh = 0,5 dm v\u00ec 0,5 dm x 0,5 dm = 0,25<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Nh\u01b0 v\u1eady chu vi c\u1ee7a h\u00ecnh tr\u00f2n = 0,5 x 2 x 3,14\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">= 3,14 (dm)<\/span><\/p>\n<p><span style=\"font-weight: 400;\">B\u00e0i t\u1eadp 5: Cho 1 h\u00ecnh tr\u00f2n c\u00f3 \u0111\u1ed9 d\u00e0i c\u1ee7a \u0111\u01b0\u1eddng k\u00ednh b\u1eb1ng 2,5cm. Chu vi = ? cm.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u0110\u00e1p \u00e1n:<\/span><\/p>\n<p><span style=\"font-weight: 400;\">B\u00e1n k\u00ednh c\u1ee7a h\u00ecnh tr\u00f2n = 2,5 \/ 2\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">= 1,25<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Chu vi = 1,25 x 1,25 x 2\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">= 3,125<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">D\u1ea1ng to\u00e1n cho chu vi, t\u00ednh \u0111\u01b0\u1eddng k\u00ednh, b\u00e1n k\u00ednh<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">D\u1ef1a v\u00e0o c\u00f4ng th\u1ee9c t\u00ednh to\u00e1n chu vi c\u1ee7a h\u00ecnh tr\u00f2n \u1edf tr\u00ean th\u00ec ch\u00fang ta c\u00f3 th\u1ec3 suy ra c\u00f4ng th\u1ee9c t\u00ednh \u0111\u01b0\u1eddng k\u00ednh v\u00e0 b\u00e1n k\u00ednh h\u00ecnh tr\u00f2n l\u00e0:<\/span><\/p>\n<p><span style=\"font-weight: 400;\">C = d x 3,14 th\u00ec suy ra d = C \/ 3,14<\/span><\/p>\n<p><span style=\"font-weight: 400;\">C = r x 2 x 3,14 th\u00ec suy ra r = C \/ 2 \/ 3,14<\/span><\/p>\n<p><span style=\"font-weight: 400;\">B\u00e0i t\u1eadp 1: Cho chu vi c\u1ee7a m\u1ed9t h\u00ecnh tr\u00f2n l\u00e0 18,84dm. H\u00e3y t\u00ednh \u0111\u01b0\u1eddng k\u00ednh v\u00e0 b\u00e1n k\u00ednh c\u1ee7a h\u00ecnh tr\u00f2n n\u00e0y?<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u0110\u00e1p \u00e1n:\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">B\u00e1n k\u00ednh = 18,84 \/ 2 \/ 3,14 = 3 (dm)<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u0110\u01b0\u1eddng k\u00ednh = 18,84 \/ 3,14 = 6 (dm)<\/span><\/p>\n<p><span style=\"font-weight: 400;\">B\u00e0i t\u1eadp 2: M\u1ed9t h\u00ecnh tr\u00f2n c\u00f3 chu vi b\u1eb1ng 25,12 cm. H\u00e3y t\u00ednh \u0111\u01b0\u1eddng k\u00ednh c\u1ee7a h\u00ecnh tr\u00f2n n\u00e0y?<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u0110\u00e1p \u00e1n:\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u0110\u01b0\u1eddng k\u00ednh = 25,12 \/ 3,14 = 8 (cm)<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-298999 aligncenter\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/chu-vi-hinh-tron-4.jpg\" alt=\"chu-vi-hinh-tron-4\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/chu-vi-hinh-tron-4.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/chu-vi-hinh-tron-4-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/chu-vi-hinh-tron-4-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">B\u00e0i t\u1eadp 3: M\u1ed9t h\u00ecnh tr\u00f2n c\u00f3 chu vi b\u1eb1ng 12, 56cm. H\u00e3y t\u00ednh b\u00e1n k\u00ednh?<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u0110\u00e1p \u00e1n:<\/span><\/p>\n<p><span style=\"font-weight: 400;\">B\u00e1n k\u00ednh = 12,56 \/ 2 \/ 3,14 = 2 (cm)<\/span><\/p>\n<p><span style=\"font-weight: 400;\">B\u00e0i t\u1eadp 4: Cho m\u1ed9t h\u00ecnh tr\u00f2n B c\u00f3 di\u1ec7n t\u00edch g\u1ea5p 16 l\u1ea7n so v\u1edbi h\u00ecnh tr\u00f2n C. V\u1eady chu vi c\u1ee7a h\u00ecnh tr\u00f2n B g\u1ea5p bao nhi\u00eau l\u1ea7n chu vi c\u1ee7a h\u00ecnh tr\u00f2n C?<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u0110\u00e1p \u00e1n:<\/span><\/p>\n<p><span style=\"font-weight: 400;\">V\u00ec h\u00ecnh tr\u00f2n B c\u00f3 di\u1ec7n t\u00edch g\u1ea5p 16 l\u1ea7n so v\u1edbi h\u00ecnh tr\u00f2n nh\u1ecf. V\u00ec v\u1eady m\u00e0 b\u00e1n k\u00ednh c\u1ee7a h\u00ecnh tr\u00f2n l\u1edbn s\u1ebd g\u1ea5p b\u1ed1n l\u1ea7n so v\u1edbi b\u00e1n k\u00ednh c\u1ee7a h\u00ecnh tr\u00f2n nh\u1ecf. T\u1eeb \u0111\u00f3 suy ra \u0111\u01b0\u1eddng k\u00ednh c\u1ee7a h\u00ecnh tr\u00f2n l\u1edbn c\u0169ng g\u1ea5p hai l\u1ea7n \u0111\u01b0\u1eddng k\u00ednh c\u1ee7a h\u00ecnh tr\u00f2n nh\u1ecf. V\u1eady th\u00ec chu vi c\u1ee7a h\u00ecnh tr\u00f2n l\u1edbn B g\u1ea5p b\u1ed1n l\u1ea7n h\u00ecnh tr\u00f2n C.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">B\u00e0i t\u1eadp 5: a. Cho chu vi c\u1ee7a m\u1ed9t h\u00ecnh tr\u00f2n b\u1eb1ng 14,13 cm. T\u00ednh \u0111\u01b0\u1eddng k\u00ednh?<\/span><\/p>\n<p>b. Cho chu vi c\u1ee7a m\u1ed9t h\u00ecnh tr\u00f2n b\u1eb1ng 18,84dm. T\u00ednh \u0111\u01b0\u1eddng k\u00ednh?<\/p>\n<p><span style=\"font-weight: 400;\">\u0110\u00e1p \u00e1n: <\/span><\/p>\n<p>a. Chu vi = \u0110\u01b0\u1eddng k\u00ednh * 3,14<\/p>\n<p><span style=\"font-weight: 400;\">\u2192 \u0110\u01b0\u1eddng k\u00ednh =\u00a0 14,13 \/ 3,14 = 4,5(cm)<\/span><\/p>\n<p>b. Chu vi = \u0110\u01b0\u1eddng k\u00ednh * 3,14<\/p>\n<p><span style=\"font-weight: 400;\">\u2192 \u0110\u01b0\u1eddng k\u00ednh = 18,84 \/ 3,14 = 6 (dm)<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Ta c\u00f3 b\u00e1n k\u00ednh = \u00bd \u0111\u1ed9 d\u00e0i \u0111\u01b0\u1eddng k\u00ednh<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u2192 B\u00e1n k\u00ednh = \u00bd x 6 = 3 (dm)<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">B\u00e0i t\u1eadp t\u1ef1 luy\u1ec7n v\u1ec1 c\u00e1ch t\u00ednh chu vi h\u00ecnh tr\u00f2n<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Sau \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 b\u00e0i t\u1eadp t\u1ef1 luy\u1ec7n v\u1ec1 c\u00e1ch t\u00ednh to\u00e1n chu vi h\u00ecnh tr\u00f2n \u0111\u1ec3 c\u00e1c b\u1ea1n h\u1ecdc sinh t\u1ef1 t\u00ecm hi\u1ec3u v\u00e0 t\u00ecm ra \u0111\u00e1p \u00e1n ch\u00ednh x\u00e1c:<\/span><\/p>\n<p><span style=\"font-weight: 400;\">B\u00e0i t\u1eadp 1: Cho m\u1ed9t b\u00e1nh xe h\u00ecnh tr\u00f2n c\u00f3 \u0111\u1ed9 d\u00e0i b\u00e1n k\u00ednh l\u00e0 0,25m. H\u00e3y t\u00ednh:<\/span><\/p>\n<ol>\n<li><span style=\"font-weight: 400;\"> \u0110\u01b0\u1eddng k\u00ednh b\u00e1nh xe?<\/span><\/li>\n<li><span style=\"font-weight: 400;\"> Chu vi b\u00e1nh xe?<\/span><\/li>\n<\/ol>\n<p><span style=\"font-weight: 400;\">B\u00e0i t\u1eadp 2: Cho chu vi c\u1ee7a 1 h\u00ecnh tr\u00f2n l\u00e0 254, 24dm. V\u1eady b\u00e1n k\u00ednh v\u00e0 \u0111\u01b0\u1eddng k\u00ednh s\u1ebd b\u1eb1ng m\u1ea5y dm?<\/span><\/p>\n<p><span style=\"font-weight: 400;\">B\u00e0i t\u1eadp 3: H\u00e3y t\u00ednh chu vi c\u1ee7a hai h\u00ecnh tr\u00f2n c\u00f3:<\/span><\/p>\n<ol>\n<li><span style=\"font-weight: 400;\"> B\u00e1n k\u00ednh = 2,5dm<\/span><\/li>\n<li><span style=\"font-weight: 400;\"> \u0110\u01b0\u1eddng k\u00ednh = 1,5cm\u00a0<\/span><\/li>\n<\/ol>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-299000 aligncenter\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/chu-vi-hinh-tron-5.jpg\" alt=\"chu-vi-hinh-tron-5\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/chu-vi-hinh-tron-5.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/chu-vi-hinh-tron-5-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/chu-vi-hinh-tron-5-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">B\u00e0i t\u1eadp 4: Cho 1 h\u00ecnh tr\u00f2n v\u1edbi \u0111\u1ed9 d\u00e0i b\u00e1n k\u00ednh l\u00e0 \u0111\u1ed9 d\u00e0i c\u1ea1nh trong 1 h\u00ecnh vu\u00f4ng s\u1edf h\u1eefu chi vi l\u00e0 25cm. Chu vi h\u00ecnh tr\u00f2n?<\/span><\/p>\n<p><span style=\"font-weight: 400;\">B\u00e0i t\u1eadp 5: Chu vi c\u1ee7a m\u1ed9t h\u00ecnh tr\u00f2n l\u00e0 56,52. V\u1eady h\u00ecnh tr\u00f2n n\u00e0y c\u00f3 \u0111\u1ed9 d\u00e0i b\u00e1n k\u00ednh l\u00e0 m\u1ea5y cm?<\/span><\/p>\n<p><span style=\"font-weight: 400;\">B\u00e0i t\u1eadp 6: a. Chu vi c\u1ee7a 1 b\u00e0n \u0103n d\u1ea1ng h\u00ecnh trong b\u1eb1ng 4,082m. M\u1eb7t b\u00e0n n\u00e0y c\u00f3 b\u00e1n k\u00ednh bao nhi\u00eau?<\/span><\/p>\n<p>b. Chu vi c\u1ee7a 1 bi\u1ec3n b\u00e1o h\u00ecnh tr\u00f2n l\u00e0 1,57m. Bi\u1ec3n b\u00e1o n\u00e0y c\u00f3 \u0111\u01b0\u1eddng k\u00ednh bao nhi\u00eau?<\/p>\n<p><span style=\"font-weight: 400;\">B\u00e0i t\u1eadp 7: M\u1ed9t h\u00ecnh tr\u00f2n c\u00f3 75% b\u00e1n k\u00ednh b\u1eb1ng 12,9m. H\u00e3y t\u00ednh chu vi?<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">M\u1eb9o gi\u00fap h\u1ecdc sinh l\u00e0m t\u1ed1t b\u00e0i t\u1eadp t\u00ednh to\u00e1n chu vi h\u00ecnh tr\u00f2n<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">V\u1ec1 c\u0103n b\u1ea3n th\u00ec c\u00f4ng th\u1ee9c t\u00ednh chu vi c\u1ee7a h\u00ecnh tr\u00f2n v\u00e0 c\u00e1c d\u1ea1ng b\u00e0i t\u1eadp li\u00ean quan kh\u00e1 d\u1ec5. Nh\u01b0ng n\u1ebfu l\u00e0m nh\u1eefng b\u00e0i t\u1eadp n\u00e2ng cao m\u1ed9t ch\u00fat th\u00ec c\u00f3 th\u1ec3 g\u00e2y ra m\u1ed9t s\u1ed1 kh\u00f3 kh\u0103n cho h\u1ecdc sinh. \u0110\u1ec3 gi\u00fap c\u00e1c b\u1ea1n gi\u1ea3i t\u1ed1t d\u1ea1ng to\u00e1n t\u00ednh chu vi n\u00e0y th\u00ec th\u1ea7y c\u00f4 v\u00e0 ph\u1ee5 huynh c\u00f3 th\u1ec3 xem m\u1ed9t s\u1ed1 m\u1eb9o sau:<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">T\u1ed5 ch\u1ee9c nh\u1eefng game v\u1ec1 h\u00ecnh tr\u00f2n trong to\u00e1n h\u1ecdc<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Nhi\u1ec1u b\u1ea1n h\u1ecdc sinh hi\u1ec7n nay c\u00f2n ham ch\u01a1i n\u00ean th\u1ea7y c\u00f4, ph\u1ee5 huynh c\u1ea7n ph\u1ea3i t\u1ed5 ch\u1ee9c nh\u1eefng game, cu\u1ed9c thi v\u1ec1 h\u00ecnh tr\u00f2n v\u00e0 c\u00e1ch t\u00ednh chu vi \u0111\u1ec3 h\u1ecdc sinh tham gia. V\u00ed d\u1ee5 ch\u00fang ta c\u00f3 th\u1ec3 t\u1ed5 ch\u1ee9c cu\u1ed9c thi ai t\u00ednh \u0111\u01b0\u1ee3c chu vi nhanh h\u01a1n v\u00e0 ch\u00ednh x\u00e1c h\u01a1n th\u00ec c\u00f3 th\u1ec3 nh\u1eadn m\u00f3n qu\u00e0 x\u1ee9ng \u0111\u00e1ng.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">C\u00f2n khi t\u1ed5 ch\u1ee9c game th\u00ec ph\u1ee5 huynh v\u00e0 th\u1ea7y c\u00f4 c\u00f3 th\u1ec3 tham gia ch\u01a1i c\u00f9ng c\u00e1c b\u1ea1n \u0111\u1ec3 n\u1eafm \u0111\u01b0\u1ee3c n\u0103ng l\u1ef1c c\u1ee7a t\u1eebng b\u1ea1n v\u00e0 k\u00edch th\u00edch s\u1ef1 h\u1ee9ng th\u00fa v\u1edbi vi\u1ec7c h\u1ecdc to\u00e1n.<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">Th\u1ef1c h\u00e0nh li\u00ean t\u1ee5c<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Sau khi c\u00e1c b\u1ea1n \u0111\u00e3 n\u1eafm ch\u1eafc ki\u1ebfn th\u1ee9c v\u1ec1 chu vi c\u1ee7a h\u00ecnh tr\u00f2n v\u00e0 nh\u1eefng d\u1ea1ng to\u00e1n li\u00ean quan th\u00ec ph\u1ee5 huynh, th\u1ea7y c\u00f4 c\u00f3 th\u1ec3 h\u01b0\u1edbng d\u1eabn c\u00e1c b\u00e9 th\u1ef1c h\u00e0nh v\u1edbi nh\u1eefng b\u00e0i t\u1eadp to\u00e1n trong s\u00e1ch gi\u00e1o khoa, b\u00e0i t\u1eadp tr\u00ean m\u1ea1ng,&#8230; \u0111\u1ec3 c\u1ea3i thi\u1ec7n k\u1ef9 n\u0103ng h\u1ecdc to\u00e1n.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-299001 aligncenter\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/chu-vi-hinh-tron-6.jpg\" alt=\"chu-vi-hinh-tron-6\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/chu-vi-hinh-tron-6.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/chu-vi-hinh-tron-6-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/chu-vi-hinh-tron-6-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">Vi\u1ec7c l\u00e0m b\u00e0i t\u1eadp li\u00ean quan \u0111\u1ebfn chu vi th\u01b0\u1eddng xuy\u00ean s\u1ebd n\u00e2ng cao \u0111\u01b0\u1ee3c n\u0103ng l\u1ef1c v\u1ec1 to\u00e1n h\u1ecdc v\u00e0 t\u1eadp luy\u1ec7n \u0111\u01b0\u1ee3c t\u00ednh si\u00eang h\u1ecdc cho c\u00e1c b\u00e9. \u0110i\u1ec1u n\u00e0y r\u1ea5t t\u1ed1t cho t\u01b0\u01a1ng lai c\u1ee7a b\u00e9.\u00a0<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">Nh\u1edb c\u00e1ch t\u00ednh chu vi c\u1ee7a h\u00ecnh trong b\u1eb1ng b\u00e0i th\u01a1<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Di\u1ec7n t\u00edch h\u00ecnh tr\u00f2n l\u1ea1i qu\u00e1 \u0111\u01a1n gi\u1ea3n<\/span><\/p>\n<p><span style=\"font-weight: 400;\">L\u1ea5y b\u00ecnh ph\u01b0\u01a1ng b\u00e1n k\u00ednh r\u1ed3i nh\u00e2n ngay v\u00e0o<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Ba ph\u1ea9y m\u01b0\u1eddi b\u1ed1n ngay \u0111\u1eb1ng sau<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Chu vi t\u00ednh mau l\u1eafm b\u1ea1n \u00e0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Ta l\u1ea5y \u0111\u01b0\u1eddng k\u00ednh m\u00e0 nh\u00e2n<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u0110\u1eb1ng sau ba ph\u1ea9y m\u01b0\u1eddi b\u1ed1n \u1ea5y l\u00e0 xong.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">N\u1ed9i dung tr\u00ean \u0111\u00e3 chia s\u1ebb v\u1ec1 c\u00e1ch t\u00ednh chu vi h\u00ecnh tr\u00f2n cho c\u00e1c b\u1ea1n c\u00f9ng tham kh\u1ea3o. Ki\u1ebfn th\u1ee9c n\u00e0y l\u00e0 n\u1ec1n t\u1ea3ng \u0111\u1ec3 c\u00e1c b\u1ea1n h\u1ecdc sinh c\u00f3 th\u1ec3 h\u1ecdc m\u00f4n to\u00e1n ng\u00e0y t\u1ed1t h\u01a1n v\u00e0 ph\u00e1t tri\u1ec3n nh\u1eefng k\u1ef9 n\u0103ng gi\u1ea3i b\u00e0i t\u1eadp to\u00e1n c\u1ee7a m\u00ecnh. H\u00e3y gi\u1ea3i ngay nh\u1eefng b\u00e0i t\u1eadp t\u1ef1 luy\u1ec7n \u1edf tr\u00ean \u0111\u1ec3 t\u00ecm ra \u0111\u00e1p \u00e1n ch\u00ednh x\u00e1c n\u00e0o.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Tham kh\u1ea3o b\u00e0i vi\u1ebft li\u00ean quan:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/dien-tich-hinh-vuong\/\"><span style=\"font-weight: 400;\">C\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng ch\u00ednh x\u00e1c nh\u1ea5t<\/span><\/a><\/li>\n<li style=\"font-weight: 400;\"><a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/cong-thuc-tinh-dien-tich-hinh-thang\/\"><span style=\"font-weight: 400;\">C\u00e1ch t\u00ednh di\u1ec7n t\u00edch h\u00ecnh thang &amp; h\u00ecnh thang vu\u00f4ng, b\u00e0i t\u1eadp th\u1ef1c h\u00e0nh minh h\u1ecda chi ti\u1ebft<\/span><\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Ph\u01b0\u01a1ng ph\u00e1p t\u00ednh to\u00e1n chu vi h\u00ecnh tr\u00f2n hi\u1ec7n nay kh\u00e1 \u0111\u01a1n gi\u1ea3n. C\u00e1c em h\u1ecdc sinh ch\u1ec9 c\u1ea7n n\u1eafm ch\u00ednh x\u00e1c c\u00f4ng th\u1ee9c t\u00ednh chu vi l\u00e0 c\u00f3 th\u1ec3 gi\u1ea3i \u0111\u01b0\u1ee3c nh\u1eefng b\u00e0i t\u1eadp h\u00ecnh h\u1ecdc nhanh ch\u00f3ng. B\u00e0i vi\u1ebft sau s\u1ebd n\u00eau r\u00f5 h\u01a1n v\u1ec1 c\u00f4ng th\u1ee9c t\u00ednh chu vi c\u1ee7a h\u00ecnh tr\u00f2n [&hellip;]<\/p>\n","protected":false},"author":102,"featured_media":298995,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3910,30453],"tags":[],"class_list":["post-298991","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-kham-pha","category-kien-thuc"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.3 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Chu vi h\u00ecnh tr\u00f2n l\u00e0 g\u00ec? C\u00f4ng th\u1ee9c v\u00e0 b\u00e0i t\u1eadp v\u1eadn d\u1ee5ng \u0111\u1ea7y \u0111\u1ee7 nh\u1ea5t<\/title>\n<meta name=\"description\" content=\"H\u1ecdc sinh c\u1ea7n n\u1eafm c\u00f4ng th\u1ee9c t\u00ednh to\u00e1n chu vi h\u00ecnh tr\u00f2n \u0111\u1ec3 gi\u1ea3i quy\u1ebft t\u1ed1t c\u00e1c b\u00e0i to\u00e1n h\u00ecnh h\u1ecdc v\u00e0 l\u00e0m b\u00e0i thi t\u1ed1t h\u01a1n.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/hoanghamobile.com\/tin-tuc\/chu-vi-hinh-tron\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Chu vi h\u00ecnh tr\u00f2n l\u00e0 g\u00ec? C\u00f4ng th\u1ee9c v\u00e0 b\u00e0i t\u1eadp v\u1eadn d\u1ee5ng \u0111\u1ea7y \u0111\u1ee7 nh\u1ea5t\" \/>\n<meta property=\"og:description\" content=\"H\u1ecdc sinh c\u1ea7n n\u1eafm c\u00f4ng th\u1ee9c t\u00ednh to\u00e1n chu vi h\u00ecnh tr\u00f2n \u0111\u1ec3 gi\u1ea3i quy\u1ebft t\u1ed1t c\u00e1c b\u00e0i to\u00e1n h\u00ecnh h\u1ecdc v\u00e0 l\u00e0m b\u00e0i thi t\u1ed1t h\u01a1n.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/hoanghamobile.com\/tin-tuc\/chu-vi-hinh-tron\/\" \/>\n<meta property=\"og:site_name\" content=\"Tin t\u1ee9c c\u00f4ng ngh\u1ec7 - HoangHaMobile\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/hoanghamobilecom\" \/>\n<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/hoanghamobilecom\" \/>\n<meta property=\"article:published_time\" content=\"2023-12-22T13:40:38+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/chu-vi-hinh-tron-7.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"628\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Nguy\u1ec5n Xu\u00e2n Thi\u00ean\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u0110\u01b0\u1ee3c vi\u1ebft b\u1edfi\" \/>\n\t<meta name=\"twitter:data1\" content=\"Nguy\u1ec5n Xu\u00e2n Thi\u00ean\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u01af\u1edbc t\u00ednh th\u1eddi gian \u0111\u1ecdc\" \/>\n\t<meta name=\"twitter:data2\" content=\"14 ph\u00fat\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/hoanghamobile.com\\\/tin-tuc\\\/chu-vi-hinh-tron\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/hoanghamobile.com\\\/tin-tuc\\\/chu-vi-hinh-tron\\\/\"},\"author\":{\"name\":\"Nguy\u1ec5n Xu\u00e2n Thi\u00ean\",\"@id\":\"https:\\\/\\\/hoanghamobile.com\\\/tin-tuc\\\/#\\\/schema\\\/person\\\/82f19cb5a6fb9de82c288acacfe400c5\"},\"headline\":\"Chu vi h\u00ecnh tr\u00f2n l\u00e0 g\u00ec? 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