{"id":542530,"date":"2026-05-01T17:28:27","date_gmt":"2026-05-01T10:28:27","guid":{"rendered":"https:\/\/hoanghamobile.com\/tin-tuc\/?p=542530"},"modified":"2026-05-01T17:28:27","modified_gmt":"2026-05-01T10:28:27","slug":"dien-tich-hinh-quat-tron","status":"publish","type":"post","link":"https:\/\/hoanghamobile.com\/tin-tuc\/dien-tich-hinh-quat-tron\/","title":{"rendered":"Di\u1ec7n t\u00edch h\u00ecnh qu\u1ea1t tr\u00f2n: C\u00f4ng th\u1ee9c, C\u00e1ch t\u00ednh v\u00e0 \u1ee8ng d\u1ee5ng"},"content":{"rendered":"<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">H\u00ecnh qu\u1ea1t tr\u00f2n l\u00e0 ph\u1ea7n h\u00ecnh tr\u00f2n \u0111\u01b0\u1ee3c gi\u1edbi h\u1ea1n b\u1edfi hai b\u00e1n k\u00ednh v\u00e0 cung tr\u00f2n. <\/span><b>Di\u1ec7n t\u00edch h\u00ecnh qu\u1ea1t tr\u00f2n<\/b><span style=\"font-weight: 400;\"> cho bi\u1ebft ph\u1ea7n kh\u00f4ng gian m\u00e0 h\u00ecnh n\u00e0y chi\u1ebfm tr\u00ean m\u1eb7t ph\u1eb3ng. Vi\u1ec7c t\u00ednh di\u1ec7n t\u00edch h\u00ecnh tr\u00f2n l\u00e0 ki\u1ebfn th\u1ee9c c\u01a1 b\u1ea3n, \u1ee9ng d\u1ee5ng r\u1ed9ng r\u00e3i trong to\u00e1n h\u1ecdc v\u00e0 th\u1ef1c t\u1ebf.<\/span><\/p>\n<h2 style=\"text-align: justify;\"><b>T\u1ed5ng quan v\u1ec1 di\u1ec7n t\u00edch h\u00ecnh qu\u1ea1t tr\u00f2n<\/b><\/h2>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Di\u1ec7n t\u00edch h\u00ecnh tr\u00f2n l\u00e0 ph\u1ea7n di\u1ec7n t\u00edch \u0111\u01b0\u1ee3c t\u1ea1o th\u00e0nh b\u1edfi hai b\u00e1n k\u00ednh v\u00e0 m\u1ed9t cung tr\u00f2n xu\u1ea5t ph\u00e1t t\u1eeb t\u00e2m h\u00ecnh tr\u00f2n. \u0110\u00e2y l\u00e0 d\u1ea1ng h\u00ecnh h\u1ecdc ph\u1ed5 bi\u1ebfn xu\u1ea5t hi\u1ec7n trong b\u00e0i t\u1eadp v\u00e0 \u1ee9ng d\u1ee5ng th\u1ef1c ti\u1ec5n.<\/span><\/p>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>\u0110\u1ecbnh ngh\u0129a h\u00ecnh qu\u1ea1t tr\u00f2n:<\/b><span style=\"font-weight: 400;\"> H\u00ecnh qu\u1ea1t tr\u00f2n l\u00e0 ph\u1ea7n h\u00ecnh tr\u00f2n b\u1ecb gi\u1edbi h\u1ea1n b\u1edfi hai b\u00e1n k\u00ednh v\u00e0 m\u1ed9t cung tr\u00f2n, c\u00f3 t\u00e2m O, b\u00e1n k\u00ednh R v\u00e0 g\u00f3c \u1edf t\u00e2m n (\u0111\u01a1n v\u1ecb \u0111\u1ed9 ho\u1eb7c radian). Hai b\u00e1n k\u00ednh chia h\u00ecnh tr\u00f2n th\u00e0nh ph\u1ea7n h\u00ecnh gi\u1ed1ng chi\u1ebfc qu\u1ea1t gi\u1ea5y.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>C\u00e1c th\u00e0nh ph\u1ea7n c\u1ea5u t\u1ea1o:<\/b>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><b>T\u00e2m (O):<\/b><span style=\"font-weight: 400;\"> \u0110i\u1ec3m ch\u00ednh gi\u1eefa h\u00ecnh tr\u00f2n.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><b>B\u00e1n k\u00ednh (R):<\/b><span style=\"font-weight: 400;\"> Kho\u1ea3ng c\u00e1ch t\u1eeb t\u00e2m \u0111\u1ebfn b\u1ea5t k\u1ef3 \u0111i\u1ec3m n\u00e0o tr\u00ean \u0111\u01b0\u1eddng tr\u00f2n.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><b>Cung tr\u00f2n:<\/b><span style=\"font-weight: 400;\"> \u0110o\u1ea1n \u0111\u01b0\u1eddng cong n\u1ed1i hai \u0111i\u1ec3m tr\u00ean \u0111\u01b0\u1eddng tr\u00f2n.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><b>G\u00f3c \u1edf t\u00e2m (n):<\/b><span style=\"font-weight: 400;\"> G\u00f3c t\u1ea1o b\u1edfi hai b\u00e1n k\u00ednh t\u1ea1i t\u00e2m.<\/span><\/li>\n<\/ul>\n<\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>K\u00ed hi\u1ec7u:<\/b><span style=\"font-weight: 400;\"> Th\u01b0\u1eddng k\u00fd hi\u1ec7u l\u00e0 <\/span><b>S<\/b><b>qu\u1ea1t<\/b><span style=\"font-weight: 400;\"> ho\u1eb7c \u0111\u01a1n gi\u1ea3n l\u00e0 <\/span><b>S<\/b><span style=\"font-weight: 400;\">.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>T\u1ea7m quan tr\u1ecdng:<\/b><span style=\"font-weight: 400;\"> Vi\u1ec7c t\u00ednh di\u1ec7n t\u00edch kh\u00f4ng ch\u1ec9 l\u00e0 ki\u1ebfn th\u1ee9c quan tr\u1ecdng trong ch\u01b0\u01a1ng tr\u00ecnh to\u00e1n h\u1ecdc c\u1ea5p 2, m\u00e0 c\u00f2n \u1ee9ng d\u1ee5ng trong t\u00ednh to\u00e1n di\u1ec7n t\u00edch v\u1eadt li\u1ec7u, thi\u1ebft k\u1ebf ki\u1ebfn tr\u00fac, \u0111\u1ed3 h\u1ecda, k\u1ef9 thu\u1eadt, x\u00e2y d\u1ef1ng hay \u0111o \u0111\u1ea1c \u0111\u1ecba l\u00fd.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>M\u1ee5c \u0111\u00edch b\u00e0i vi\u1ebft:<\/b><span style=\"font-weight: 400;\"> B\u00e0i vi\u1ebft n\u00e0y s\u1ebd gi\u00fap b\u1ea1n hi\u1ec3u r\u00f5 l\u00fd thuy\u1ebft, c\u00e1c c\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch, v\u00ed d\u1ee5 minh h\u1ecda c\u1ee5 th\u1ec3, b\u00e0i t\u1eadp th\u1ef1c h\u00e0nh v\u00e0 \u1ee9ng d\u1ee5ng trong th\u1ef1c t\u1ebf.<\/span><\/li>\n<\/ul>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter size-full wp-image-542736\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/04\/dien-tich-hinh-quat-tron-1.jpg\" alt=\"dien-tich-hinh-quat-tron-1\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/04\/dien-tich-hinh-quat-tron-1.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/04\/dien-tich-hinh-quat-tron-1-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/04\/dien-tich-hinh-quat-tron-1-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2 style=\"text-align: justify;\"><b>C\u00f4ng th\u1ee9c v\u00e0 c\u00e1ch t\u00ednh di\u1ec7n t\u00edch h\u00ecnh qu\u1ea1t tr\u00f2n<\/b><\/h2>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">\u0110\u1ec3 t\u00ednh di\u1ec7n t\u00edch, b\u1ea1n c\u00f3 th\u1ec3 \u00e1p d\u1ee5ng nhi\u1ec1u c\u00f4ng th\u1ee9c kh\u00e1c nhau t\u00f9y theo th\u00f4ng tin \u0111\u1ec1 b\u00e0i cho, nh\u01b0 b\u00e1n k\u00ednh, g\u00f3c \u1edf t\u00e2m ho\u1eb7c \u0111\u1ed9 d\u00e0i cung tr\u00f2n. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 c\u00e1c c\u00e1ch t\u00ednh ph\u1ed5 bi\u1ebfn nh\u1ea5t k\u00e8m v\u00ed d\u1ee5 minh h\u1ecda.<\/span><\/p>\n<h3 style=\"text-align: justify;\"><b>C\u00f4ng th\u1ee9c c\u01a1 b\u1ea3n<\/b><\/h3>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">C\u00f4ng th\u1ee9c n\u00e0y l\u00e0 t\u1ef7 l\u1ec7 ph\u1ea7n g\u00f3c \u1edf t\u00e2m so v\u1edbi to\u00e0n b\u1ed9 h\u00ecnh tr\u00f2n nh\u00e2n v\u1edbi di\u1ec7n t\u00edch h\u00ecnh tr\u00f2n c\u00f9ng b\u00e1n k\u00ednh. N\u1ebfu h\u00ecnh tr\u00f2n \u0111\u1ea7y \u0111\u1ee7 c\u00f3 di\u1ec7n t\u00edch <\/span><b>S = \u03c0R\u00b2<\/b><span style=\"font-weight: 400;\">, th\u00ec di\u1ec7n t\u00edch l\u00e0 ph\u1ea7n t\u01b0\u01a1ng \u1ee9ng v\u1edbi g\u00f3c \u1edf t\u00e2m.<\/span><\/p>\n<h3 style=\"text-align: justify;\"><b>T\u00ednh theo g\u00f3c \u1edf t\u00e2m (\u0111\u01a1n v\u1ecb \u0111\u1ed9)<\/b><\/h3>\n<table>\n<tbody>\n<tr>\n<td><b>C\u00f4ng th\u1ee9c<\/b><\/td>\n<td><b>S = (\u03c0 \u00d7 R\u00b2 \u00d7 n) \/ 360<\/b><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>R:<\/b><span style=\"font-weight: 400;\"> B\u00e1n k\u00ednh h\u00ecnh tr\u00f2n (\u0111\u01a1n v\u1ecb: cm, m,&#8230;)<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>n:<\/b><span style=\"font-weight: 400;\"> S\u1ed1 \u0111o g\u00f3c \u1edf t\u00e2m (\u0111\u01a1n v\u1ecb: \u0111\u1ed9, t\u1eeb 0\u00b0 \u0111\u1ebfn 360\u00b0)<\/span><\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><b>V\u00ed d\u1ee5:<\/b><span style=\"font-weight: 400;\"> Cho h\u00ecnh qu\u1ea1t tr\u00f2n b\u00e1n k\u00ednh R = 5 cm, g\u00f3c \u1edf t\u00e2m n = 60\u00b0.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">\u00c1p d\u1ee5ng c\u00f4ng th\u1ee9c:<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">S = (\u03c0 \u00d7 5\u00b2 \u00d7 60) \/ 360 = (\u03c0 \u00d7 25 \u00d7 60) \/ 360 = (\u03c0 \u00d7 1500) \/ 360 = (1500\u03c0) \/ 360 \u2248 13,09 cm\u00b2<\/span><\/p>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-542737\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/04\/dien-tich-hinh-quat-tron-2.jpg\" alt=\"dien-tich-hinh-quat-tron-2\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/04\/dien-tich-hinh-quat-tron-2.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/04\/dien-tich-hinh-quat-tron-2-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/04\/dien-tich-hinh-quat-tron-2-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h3 style=\"text-align: justify;\"><b>T\u00ednh theo g\u00f3c \u1edf t\u00e2m (\u0111\u01a1n v\u1ecb radian)<\/b><\/h3>\n<table>\n<tbody>\n<tr>\n<td><b>C\u00f4ng th\u1ee9c<\/b><\/td>\n<td><b>S = (1\/2) \u00d7 R\u00b2 \u00d7 \u03b1<\/b><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>R:<\/b><span style=\"font-weight: 400;\"> B\u00e1n k\u00ednh h\u00ecnh tr\u00f2n<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>\u03b1:<\/b><span style=\"font-weight: 400;\"> S\u1ed1 \u0111o g\u00f3c \u1edf t\u00e2m (\u0111\u01a1n v\u1ecb: radian, t\u1eeb 0 \u0111\u1ebfn 2\u03c0)<\/span><\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><b>V\u00ed d\u1ee5:<\/b><span style=\"font-weight: 400;\"> H\u00ecnh qu\u1ea1t tr\u00f2n c\u00f3 b\u00e1n k\u00ednh R = 3 cm, g\u00f3c \u1edf t\u00e2m \u03b1 = \u03c0\/3 rad.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">S = (1\/2) \u00d7 3\u00b2 \u00d7 (\u03c0\/3) = (1\/2) \u00d7 9 \u00d7 (\u03c0\/3) = (9\/2) \u00d7 (\u03c0\/3) = (9\u03c0) \/ 6 = (3\u03c0) \/ 2 \u2248 4,71 cm\u00b2<\/span><\/p>\n<h3 style=\"text-align: justify;\"><b>T\u00ednh theo \u0111\u1ed9 d\u00e0i cung tr\u00f2n<\/b><\/h3>\n<table>\n<tbody>\n<tr>\n<td><b>C\u00f4ng th\u1ee9c<\/b><\/td>\n<td><b>S = (1\/2) \u00d7 R \u00d7 l<\/b><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>R:<\/b><span style=\"font-weight: 400;\"> B\u00e1n k\u00ednh h\u00ecnh tr\u00f2n<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>l:<\/b><span style=\"font-weight: 400;\"> \u0110\u1ed9 d\u00e0i cung tr\u00f2n (\u0111\u01a1n v\u1ecb: cm, m,&#8230;)<\/span><\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><b>V\u00ed d\u1ee5:<\/b><span style=\"font-weight: 400;\"> H\u00ecnh qu\u1ea1t tr\u00f2n c\u00f3 b\u00e1n k\u00ednh R = 4 cm, \u0111\u1ed9 d\u00e0i cung l = 5 cm.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">S = (1\/2) \u00d7 4 \u00d7 5 = 2 \u00d7 5 = 10 cm\u00b2<\/span><\/p>\n<p style=\"text-align: justify;\"><b>L\u01b0u \u00fd:<\/b><span style=\"font-weight: 400;\"> \u0110\u1ea3m b\u1ea3o s\u1eed d\u1ee5ng \u0111\u00fang \u0111\u01a1n v\u1ecb \u0111o v\u00e0 chuy\u1ec3n \u0111\u1ed5i g\u00f3c t\u1eeb \u0111\u1ed9 sang radian khi \u00e1p d\u1ee5ng c\u00e1c c\u00f4ng th\u1ee9c t\u01b0\u01a1ng \u1ee9ng.<\/span><\/p>\n<h2 style=\"text-align: justify;\"><b>Di\u1ec7n t\u00edch h\u00ecnh qu\u1ea1t tr\u00f2n cho h\u1ecdc sinh l\u1edbp 9 v\u00e0 n\u00e2ng cao<\/b><\/h2>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Trong ch\u01b0\u01a1ng tr\u00ecnh To\u00e1n l\u1edbp 9, c\u00e1c c\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch \u0111\u01b0\u1ee3c tr\u00ecnh b\u00e0y r\u00f5 r\u00e0ng, l\u00e0 n\u1ec1n t\u1ea3ng cho c\u00e1c b\u00e0i to\u00e1n h\u00ecnh h\u1ecdc ph\u1eb3ng v\u00e0 n\u00e2ng cao. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 t\u1ed5ng h\u1ee3p ki\u1ebfn th\u1ee9c tr\u1ecdng t\u00e2m k\u00e8m m\u1edf r\u1ed9ng.<\/span><\/p>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>C\u00f4ng th\u1ee9c l\u1edbp 9:<\/b>\n<ol>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><b>\u0110\u01a1n v\u1ecb \u0111\u1ed9:<\/b><span style=\"font-weight: 400;\"> S = (\u03c0 \u00d7 R\u00b2 \u00d7 n) \/ 360<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><b>\u0110\u01a1n v\u1ecb radian:<\/b><span style=\"font-weight: 400;\"> S = (1\/2) \u00d7 R\u00b2 \u00d7 \u03b1<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><b>Theo \u0111\u1ed9 d\u00e0i cung:<\/b><span style=\"font-weight: 400;\"> S = (1\/2) \u00d7 R \u00d7 l<\/span><\/li>\n<\/ol>\n<\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>B\u01b0\u1edbc gi\u1ea3i b\u00e0i t\u1eadp:<\/b>\n<ol>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">X\u00e1c \u0111\u1ecbnh th\u00f4ng s\u1ed1 \u0111\u1ec1 b\u00e0i (b\u00e1n k\u00ednh, g\u00f3c \u1edf t\u00e2m, \u0111\u1ed9 d\u00e0i cung tr\u00f2n).<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">Chuy\u1ec3n \u0111\u1ed5i \u0111\u01a1n v\u1ecb n\u1ebfu c\u1ea7n (\u0111\u1ed9 sang radian: 1 rad \u2248 57,3\u00b0).<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">\u00c1p d\u1ee5ng c\u00f4ng th\u1ee9c ph\u00f9 h\u1ee3p.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"2\"><span style=\"font-weight: 400;\">Tr\u00ecnh b\u00e0y r\u00f5 r\u00e0ng, k\u00e8m \u0111\u01a1n v\u1ecb k\u1ebft qu\u1ea3.<\/span><\/li>\n<\/ol>\n<\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>C\u00f4ng th\u1ee9c n\u00e2ng cao:<\/b><span style=\"font-weight: 400;\"> Khi h\u00ecnh qu\u1ea1t tr\u00f2n l\u00e0 ph\u1ea7n c\u1ee7a h\u00ecnh v\u00e0nh khuy\u00ean, h\u00ecnh tr\u00f2n \u0111\u1ed3ng t\u00e2m ho\u1eb7c khi k\u1ebft h\u1ee3p di\u1ec7n t\u00edch tam gi\u00e1c t\u1ea1o th\u00e0nh, h\u1ecdc sinh c\u1ea7n v\u1eadn d\u1ee5ng th\u00eam ki\u1ebfn th\u1ee9c v\u1ec1 di\u1ec7n t\u00edch h\u00ecnh tr\u00f2n, h\u00ecnh tam gi\u00e1c v\u00e0 c\u00e1c li\u00ean h\u1ec7 gi\u1eefa c\u00e1c g\u00f3c.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>T\u00e0i li\u1ec7u tham kh\u1ea3o:<\/b><span style=\"font-weight: 400;\"> C\u00e1c s\u00e1ch gi\u00e1o khoa To\u00e1n l\u1edbp 9, t\u00e0i li\u1ec7u VietJack, S\u00e1ch b\u00e0i t\u1eadp n\u00e2ng cao, v\u00e0 c\u00e1c chuy\u00ean \u0111\u1ec1 h\u00ecnh h\u1ecdc ph\u1eb3ng.<\/span><\/li>\n<\/ul>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-542738\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/04\/dien-tich-hinh-quat-tron-3.jpg\" alt=\"dien-tich-hinh-quat-tron-3\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/04\/dien-tich-hinh-quat-tron-3.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/04\/dien-tich-hinh-quat-tron-3-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/04\/dien-tich-hinh-quat-tron-3-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<p style=\"text-align: justify;\"><b>V\u00ed d\u1ee5 l\u1edbp 9:<\/b><span style=\"font-weight: 400;\"> H\u00ecnh qu\u1ea1t tr\u00f2n c\u00f3 b\u00e1n k\u00ednh R = 7 cm, g\u00f3c \u1edf t\u00e2m n = 120\u00b0.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">S = (\u03c0 \u00d7 7\u00b2 \u00d7 120) \/ 360 = (\u03c0 \u00d7 49 \u00d7 120) \/ 360 = (\u03c0 \u00d7 5880) \/ 360 = (5880\u03c0) \/ 360 \u2248 51,26 cm\u00b2<\/span><\/p>\n<p style=\"text-align: justify;\"><b>M\u1eb9o:<\/b><span style=\"font-weight: 400;\"> Khi g\u1eb7p h\u00ecnh ph\u1ee9c t\u1ea1p, h\u00e3y chia nh\u1ecf th\u00e0nh c\u00e1c h\u00ecnh <a href=\"https:\/\/hoanghamobile.com\/dien-may\/quat\"><strong>qu\u1ea1t<\/strong> <\/a>tr\u00f2n, h\u00ecnh tam gi\u00e1c, h\u00ecnh tr\u00f2n \u0111\u1ec3 d\u1ec5 t\u00ednh t\u1ed5ng di\u1ec7n t\u00edch.<\/span><\/p>\n<h2 style=\"text-align: justify;\"><b>C\u00e1c b\u00e0i t\u1eadp v\u00e0 v\u00ed d\u1ee5<\/b><\/h2>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">\u0110\u1ec3 th\u00e0nh th\u1ea1o c\u00e1ch t\u00ednh<\/span><b> di\u1ec7n t\u00edch h\u00ecnh qu\u1ea1t tr\u00f2n<\/b><span style=\"font-weight: 400;\">, h\u00e3y luy\u1ec7n t\u1eadp v\u1edbi c\u00e1c d\u1ea1ng b\u00e0i t\u1eeb c\u01a1 b\u1ea3n \u0111\u1ebfn n\u00e2ng cao. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 v\u00ed d\u1ee5 v\u00e0 b\u00e0i t\u1eadp t\u1ef1 luy\u1ec7n gi\u00fap b\u1ea1n c\u1ee7ng c\u1ed1 ki\u1ebfn th\u1ee9c.<\/span><\/p>\n<h3 style=\"text-align: justify;\"><b>B\u00e0i t\u1eadp m\u1eabu<\/b><\/h3>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>B\u00e0i 1:<\/b><span style=\"font-weight: 400;\"> T\u00ednh di\u1ec7n t\u00edch c\u00f3 b\u00e1n k\u00ednh R = 10 cm, g\u00f3c \u1edf t\u00e2m n = 45\u00b0.<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><i><span style=\"font-weight: 400;\">Gi\u1ea3i:<\/span><\/i><i><span style=\"font-weight: 400;\"><br \/>\n<\/span><\/i><span style=\"font-weight: 400;\">S = (\u03c0 \u00d7 10\u00b2 \u00d7 45) \/ 360 = (\u03c0 \u00d7 100 \u00d7 45) \/ 360 = (\u03c0 \u00d7 4500) \/ 360 \u2248 39,27 cm\u00b2<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>B\u00e0i 2:<\/b><span style=\"font-weight: 400;\"> M\u1ed9t h\u00ecnh qu\u1ea1t tr\u00f2n c\u00f3 b\u00e1n k\u00ednh R = 8 cm, g\u00f3c \u1edf t\u00e2m \u03b1 = \u03c0\/4 rad. H\u1ecfi di\u1ec7n t\u00edch?<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><i><span style=\"font-weight: 400;\">Gi\u1ea3i:<\/span><\/i><i><span style=\"font-weight: 400;\"><br \/>\n<\/span><\/i><span style=\"font-weight: 400;\">S = (1\/2) \u00d7 8\u00b2 \u00d7 (\u03c0\/4) = (1\/2) \u00d7 64 \u00d7 (\u03c0\/4) = 32 \u00d7 (\u03c0\/4) = 8\u03c0 \u2248 25,13 cm\u00b2<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>B\u00e0i 3:<\/b><span style=\"font-weight: 400;\"> H\u00ecnh qu\u1ea1t tr\u00f2n b\u00e1n k\u00ednh R = 6 cm, \u0111\u1ed9 d\u00e0i cung l = 6\u03c0 cm.<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><i><span style=\"font-weight: 400;\">Gi\u1ea3i:<\/span><\/i><i><span style=\"font-weight: 400;\"><br \/>\n<\/span><\/i><span style=\"font-weight: 400;\">S = (1\/2) \u00d7 6 \u00d7 6\u03c0 = 3 \u00d7 6\u03c0 = 18\u03c0 \u2248 56,55 cm\u00b2<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>B\u00e0i 4:<\/b><span style=\"font-weight: 400;\"> M\u1ed9t h\u00ecnh qu\u1ea1t tr\u00f2n c\u00f3 di\u1ec7n t\u00edch l\u00e0 25 cm\u00b2, b\u00e1n k\u00ednh 5 cm. T\u00ecm s\u1ed1 \u0111o g\u00f3c \u1edf t\u00e2m n (\u0111\u1ed9)?<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><i><span style=\"font-weight: 400;\">Gi\u1ea3i:<\/span><\/i><i><span style=\"font-weight: 400;\"><br \/>\n<\/span><\/i><span style=\"font-weight: 400;\">S = (\u03c0 \u00d7 R\u00b2 \u00d7 n) \/ 360 \u21d2 25 = (\u03c0 \u00d7 25 \u00d7 n) \/ 360<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\"> \u21d2 (25 \u00d7 360) \/ (\u03c0 \u00d7 25) = n<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\"> \u21d2 n = 360 \/ \u03c0 \u2248 114,59\u00b0<\/span><\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-542739\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/04\/dien-tich-hinh-quat-tron-4.jpg\" alt=\"dien-tich-hinh-quat-tron-4\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/04\/dien-tich-hinh-quat-tron-4.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/04\/dien-tich-hinh-quat-tron-4-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/04\/dien-tich-hinh-quat-tron-4-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h3 style=\"text-align: justify;\"><b>B\u00e0i t\u1eadp t\u1ef1 luy\u1ec7n<\/b><\/h3>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">T\u00ednh di\u1ec7n t\u00edch h\u00ecnh qu\u1ea1t b\u00e1n k\u00ednh 12 cm, g\u00f3c \u1edf t\u00e2m 75\u00b0.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">H\u00ecnh qu\u1ea1t tr\u00f2n c\u00f3 b\u00e1n k\u00ednh 9 cm, g\u00f3c \u1edf t\u00e2m \u03c0\/2 rad. Di\u1ec7n t\u00edch b\u1eb1ng bao nhi\u00eau?<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Cho h\u00ecnh qu\u1ea1t tr\u00f2n c\u00f3 \u0111\u1ed9 d\u00e0i cung 8 cm v\u00e0 b\u00e1n k\u00ednh 4 cm. T\u00ednh di\u1ec7n t\u00edch.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">B\u00e0i to\u00e1n th\u1ef1c t\u1ebf: M\u1ed9t mi\u1ebfng b\u00e1nh pizza h\u00ecnh qu\u1ea1t tr\u00f2n c\u00f3 b\u00e1n k\u00ednh 15 cm, g\u00f3c \u1edf t\u00e2m 60\u00b0. Mi\u1ebfng b\u00e1nh chi\u1ebfm di\u1ec7n t\u00edch bao nhi\u00eau?<\/span><\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><b>G\u1ee3i \u00fd:<\/b><span style=\"font-weight: 400;\"> Lu\u00f4n x\u00e1c \u0111\u1ecbnh r\u00f5 d\u1eef ki\u1ec7n b\u00e0i to\u00e1n, v\u1ebd h\u00ecnh minh h\u1ecda v\u00e0 ghi ch\u00fa \u0111\u01a1n v\u1ecb k\u1ebft qu\u1ea3.<\/span><\/p>\n<h2 style=\"text-align: justify;\"><b>So s\u00e1nh v\u00e0 li\u00ean h\u1ec7 v\u1edbi c\u00e1c h\u00ecnh h\u1ecdc kh\u00e1c<\/b><\/h2>\n<p style=\"text-align: justify;\"><b>Di\u1ec7n t\u00edch h\u00ecnh qu\u1ea1t tr\u00f2n<\/b><span style=\"font-weight: 400;\"> c\u00f3 m\u1ed1i li\u00ean h\u1ec7 \u0111\u1eb7c bi\u1ec7t v\u1edbi di\u1ec7n t\u00edch h\u00ecnh tr\u00f2n, h\u00ecnh v\u00e0nh khuy\u00ean, h\u00ecnh tam gi\u00e1c v\u00e0 c\u00e1c h\u00ecnh ph\u1eb3ng kh\u00e1c. Vi\u1ec7c hi\u1ec3u c\u00e1c m\u1ed1i li\u00ean h\u1ec7 n\u00e0y gi\u00fap m\u1edf r\u1ed9ng t\u01b0 duy h\u00ecnh h\u1ecdc v\u00e0 gi\u1ea3i c\u00e1c b\u00e0i to\u00e1n t\u1ed5ng h\u1ee3p.<\/span><\/p>\n<ul style=\"text-align: justify;\">\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>So s\u00e1nh v\u1edbi di\u1ec7n t\u00edch h\u00ecnh tr\u00f2n:<\/b><span style=\"font-weight: 400;\"> H\u00ecnh qu\u1ea1t tr\u00f2n l\u00e0 m\u1ed9t ph\u1ea7n c\u1ee7a h\u00ecnh tr\u00f2n. Khi g\u00f3c \u1edf t\u00e2m l\u00e0 360\u00b0, di\u1ec7n t\u00edch tr\u1edf th\u00e0nh di\u1ec7n t\u00edch h\u00ecnh tr\u00f2n. T\u1ef7 l\u1ec7 di\u1ec7n t\u00edch l\u00e0 t\u1ec9 l\u1ec7 g\u00f3c \u1edf t\u00e2m n\/360 (\u0111\u1ed9) ho\u1eb7c \u03b1\/2\u03c0 (radian).<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Li\u00ean h\u1ec7 v\u1edbi h\u00ecnh v\u00e0nh khuy\u00ean:<\/b><span style=\"font-weight: 400;\"> H\u00ecnh v\u00e0nh khuy\u00ean l\u00e0 ph\u1ea7n di\u1ec7n t\u00edch gi\u1eefa hai h\u00ecnh tr\u00f2n \u0111\u1ed3ng t\u00e2m b\u00e1n k\u00ednh l\u1edbn R, nh\u1ecf r. N\u1ebfu l\u1ea5y m\u1ed9t ph\u1ea7n h\u00ecnh v\u00e0nh khuy\u00ean theo m\u1ed9t g\u00f3c \u1edf t\u00e2m, ta \u0111\u01b0\u1ee3c &#8220;h\u00ecnh qu\u1ea1t v\u00e0nh khuy\u00ean&#8221;. C\u00f4ng th\u1ee9c:<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">S = [(\u03c0R\u00b2 &#8211; \u03c0r\u00b2) \u00d7 n] \/ 360 (v\u1edbi n l\u00e0 s\u1ed1 \u0111\u1ed9)<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Li\u00ean h\u1ec7 v\u1edbi h\u00ecnh tam gi\u00e1c:<\/b><span style=\"font-weight: 400;\"> Khi g\u00f3c \u1edf t\u00e2m nh\u1ecf, h\u00ecnh qu\u1ea1t tr\u00f2n g\u1ea7n gi\u1ed1ng v\u1edbi h\u00ecnh tam gi\u00e1c c\u00e2n c\u00f3 hai c\u1ea1nh b\u1eb1ng b\u00e1n k\u00ednh v\u00e0 g\u00f3c \u1edf \u0111\u1ec9nh l\u00e0 g\u00f3c \u1edf t\u00e2m.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>\u1ee8ng d\u1ee5ng trong c\u00e1c b\u00e0i to\u00e1n t\u1ed5ng h\u1ee3p:<\/b><span style=\"font-weight: 400;\"> Nhi\u1ec1u b\u00e0i to\u00e1n y\u00eau c\u1ea7u t\u00ednh di\u1ec7n t\u00edch ph\u1ea7n t\u00f4 m\u00e0u, ph\u1ea7n giao nhau gi\u1eefa h\u00ecnh qu\u1ea1t, h\u00ecnh tr\u00f2n, tam gi\u00e1c,&#8230; \u0111\u00f2i h\u1ecfi h\u1ecdc sinh v\u1eadn d\u1ee5ng linh ho\u1ea1t c\u00e1c c\u00f4ng th\u1ee9c li\u00ean quan.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Trong th\u1ef1c t\u1ebf:<\/b><span style=\"font-weight: 400;\"> C\u00e1c khu v\u1ef1c h\u00ecnh qu\u1ea1t tr\u00f2n xu\u1ea5t hi\u1ec7n \u1edf \u0111\u1ed3ng h\u1ed3, b\u00e1nh pizza, thi\u1ebft k\u1ebf s\u00e2n v\u01b0\u1eddn, m\u1eb7t \u0111\u1ed3ng h\u1ed3 \u0111o, qu\u1ea1t gi\u1ea5y, bi\u1ec3u \u0111\u1ed3 tr\u00f2n, v.v.<\/span><\/li>\n<\/ul>\n<p style=\"text-align: justify;\"><b>V\u00ed d\u1ee5 m\u1edf r\u1ed9ng:<\/b><span style=\"font-weight: 400;\"> M\u1ed9t h\u00ecnh qu\u1ea1t v\u00e0nh khuy\u00ean c\u00f3 b\u00e1n k\u00ednh ngo\u00e0i 10 cm, b\u00e1n k\u00ednh trong 4 cm, g\u00f3c \u1edf t\u00e2m 90\u00b0.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">S = [(\u03c0 \u00d7 10\u00b2 &#8211; \u03c0 \u00d7 4\u00b2) \u00d7 90] \/ 360 = [(\u03c0 \u00d7 100 &#8211; \u03c0 \u00d7 16) \u00d7 90] \/ 360 = [\u03c0 \u00d7 84 \u00d7 90] \/ 360 = (7560\u03c0) \/ 360 = 21\u03c0 \u2248 65,97 cm\u00b2<\/span><\/p>\n<h2 style=\"text-align: justify;\"><b>C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p<\/b><\/h2>\n<h3 style=\"text-align: justify;\"><b>1. C\u00f4ng th\u1ee9c di\u1ec7n t\u00edch h\u00ecnh qu\u1ea1t tr\u00f2n l\u00e0 g\u00ec?<\/b><\/h3>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">C\u00f4ng th\u1ee9c c\u01a1 b\u1ea3n l\u00e0 S = (\u03c0 \u00d7 R\u00b2 \u00d7 n) \/ 360 (v\u1edbi n l\u00e0 \u0111\u1ed9) ho\u1eb7c S = (1\/2) \u00d7 R\u00b2 \u00d7 \u03b1 (v\u1edbi \u03b1 l\u00e0 radian). N\u1ebfu bi\u1ebft \u0111\u1ed9 d\u00e0i cung, d\u00f9ng S = (1\/2) \u00d7 R \u00d7 l.<\/span><\/p>\n<h3 style=\"text-align: justify;\"><b>2. L\u00e0m sao chuy\u1ec3n \u0111\u1ed5i gi\u1eefa g\u00f3c \u0111\u1ed9 v\u00e0 radian?<\/b><\/h3>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">1 radian \u2248 57,3\u00b0. \u0110\u1ec3 chuy\u1ec3n t\u1eeb \u0111\u1ed9 sang radian: \u03b1 (rad) = n (\u0111\u1ed9) \u00d7 \u03c0 \/ 180. \u0110\u1ec3 chuy\u1ec3n t\u1eeb radian sang \u0111\u1ed9: n (\u0111\u1ed9) = \u03b1 (rad) \u00d7 180 \/ \u03c0.<\/span><\/p>\n<h3 style=\"text-align: justify;\"><b>3. Khi n\u00e0o s\u1eed d\u1ee5ng c\u00f4ng th\u1ee9c theo cung tr\u00f2n?<\/b><\/h3>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Khi \u0111\u1ec1 b\u00e0i cho bi\u1ebft \u0111\u1ed9 d\u00e0i cung tr\u00f2n (l), b\u1ea1n d\u00f9ng c\u00f4ng th\u1ee9c S = (1\/2) \u00d7 R \u00d7 l \u0111\u1ec3 t\u00ednh di\u1ec7n t\u00edch nhanh ch\u00f3ng m\u00e0 kh\u00f4ng c\u1ea7n bi\u1ebft g\u00f3c \u1edf t\u00e2m.<\/span><\/p>\n<h3 style=\"text-align: justify;\"><b>4. Di\u1ec7n t\u00edch h\u00ecnh tr\u00f2n c\u00f3 th\u1ec3 l\u1edbn h\u01a1n di\u1ec7n t\u00edch h\u00ecnh tr\u00f2n kh\u00f4ng?<\/b><\/h3>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">Kh\u00f4ng th\u1ec3. Di\u1ec7n t\u00edch h\u00ecnh tr\u00f2n lu\u00f4n nh\u1ecf h\u01a1n ho\u1eb7c b\u1eb1ng di\u1ec7n t\u00edch h\u00ecnh tr\u00f2n c\u00f9ng b\u00e1n k\u00ednh (ch\u1ec9 b\u1eb1ng khi g\u00f3c \u1edf t\u00e2m l\u00e0 360\u00b0).<\/span><\/p>\n<h3 style=\"text-align: justify;\"><b>5. B\u00e0i to\u00e1n th\u1ef1c t\u1ebf n\u00e0o th\u01b0\u1eddng g\u1eb7p li\u00ean quan \u0111\u1ebfn h\u00ecnh qu\u1ea1t tr\u00f2n?<\/b><\/h3>\n<p style=\"text-align: justify;\"><span style=\"font-weight: 400;\">C\u00e1c b\u00e0i to\u00e1n v\u1ec1 thi\u1ebft k\u1ebf m\u1eb7t \u0111\u1ed3ng h\u1ed3, chia ph\u1ea7n b\u00e1nh pizza, thi\u1ebft k\u1ebf s\u00e2n v\u01b0\u1eddn, t\u00ednh di\u1ec7n t\u00edch ph\u1ee7 s\u01a1n, ho\u1eb7c mi\u1ebfng qu\u1ea1t gi\u1ea5y \u0111\u1ec1u li\u00ean quan t\u1edbi di\u1ec7n t\u00edch h\u00ecnh tr\u00f2n.<\/span><\/p>\n<p style=\"text-align: justify;\"><b>Xem th\u00eam:<\/b><\/p>\n<ul>\n<li><a class=\"row-title\" href=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-admin\/post.php?post=531243&amp;action=edit\" aria-label=\"\u201cT\u1eadp h\u1ee3p Z: Kh\u00e1i ni\u1ec7m, \u0111\u1eb7c \u0111i\u1ec3m v\u00e0 \u1ee9ng d\u1ee5ng c\u1ee7a s\u1ed1 nguy\u00ean trong to\u00e1n h\u1ecdc\u201d (Ch\u1ec9nh s\u1eeda)\">T\u1eadp h\u1ee3p Z: Kh\u00e1i ni\u1ec7m, \u0111\u1eb7c \u0111i\u1ec3m v\u00e0 \u1ee9ng d\u1ee5ng c\u1ee7a s\u1ed1 nguy\u00ean trong to\u00e1n h\u1ecdc<\/a><\/li>\n<li><a class=\"row-title\" href=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-admin\/post.php?post=413702&amp;action=edit\" aria-label=\"\u201cGeoGebra \u2013 Ph\u1ea7n m\u1ec1m v\u1ebd \u0111\u1ed3 th\u1ecb h\u00e0m s\u1ed1, c\u00f4ng th\u1ee9c To\u00e1n h\u1ecdc\u201d (Ch\u1ec9nh s\u1eeda)\">GeoGebra \u2013 Ph\u1ea7n m\u1ec1m v\u1ebd \u0111\u1ed3 th\u1ecb h\u00e0m s\u1ed1, c\u00f4ng th\u1ee9c To\u00e1n h\u1ecdc<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>H\u00ecnh qu\u1ea1t tr\u00f2n l\u00e0 ph\u1ea7n h\u00ecnh tr\u00f2n \u0111\u01b0\u1ee3c gi\u1edbi h\u1ea1n b\u1edfi hai b\u00e1n k\u00ednh v\u00e0 cung tr\u00f2n. Di\u1ec7n t\u00edch h\u00ecnh qu\u1ea1t tr\u00f2n cho bi\u1ebft ph\u1ea7n kh\u00f4ng gian m\u00e0 h\u00ecnh n\u00e0y chi\u1ebfm tr\u00ean m\u1eb7t ph\u1eb3ng. Vi\u1ec7c t\u00ednh di\u1ec7n t\u00edch h\u00ecnh tr\u00f2n l\u00e0 ki\u1ebfn th\u1ee9c c\u01a1 b\u1ea3n, \u1ee9ng d\u1ee5ng r\u1ed9ng r\u00e3i trong to\u00e1n h\u1ecdc v\u00e0 th\u1ef1c t\u1ebf. [&hellip;]<\/p>\n","protected":false},"author":84,"featured_media":542735,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[29235,3910,30453],"tags":[],"class_list":["post-542530","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-goc-to-mo","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>Di\u1ec7n t\u00edch h\u00ecnh qu\u1ea1t tr\u00f2n: C\u00f4ng th\u1ee9c, C\u00e1ch t\u00ednh v\u00e0 \u1ee8ng d\u1ee5ng<\/title>\n<meta name=\"description\" content=\"Kh\u00e1m ph\u00e1 to\u00e0n b\u1ed9 v\u1ec1 di\u1ec7n t\u00edch h\u00ecnh qu\u1ea1t tr\u00f2n: \u0111\u1ecbnh ngh\u0129a, c\u00f4ng th\u1ee9c chi ti\u1ebft (\u0111\u1ed9, radian, cung), b\u00e0i t\u1eadp th\u1ef1c t\u1ebf v\u00e0 \u1ee9ng d\u1ee5ng.\" \/>\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\/dien-tich-hinh-quat-tron\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Di\u1ec7n t\u00edch h\u00ecnh qu\u1ea1t tr\u00f2n: C\u00f4ng th\u1ee9c, C\u00e1ch t\u00ednh v\u00e0 \u1ee8ng d\u1ee5ng\" \/>\n<meta property=\"og:description\" content=\"Kh\u00e1m ph\u00e1 to\u00e0n b\u1ed9 v\u1ec1 di\u1ec7n t\u00edch h\u00ecnh qu\u1ea1t tr\u00f2n: \u0111\u1ecbnh ngh\u0129a, c\u00f4ng th\u1ee9c chi ti\u1ebft (\u0111\u1ed9, radian, cung), b\u00e0i t\u1eadp th\u1ef1c t\u1ebf v\u00e0 \u1ee9ng d\u1ee5ng.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/hoanghamobile.com\/tin-tuc\/dien-tich-hinh-quat-tron\/\" \/>\n<meta property=\"og:site_name\" content=\"Tin t\u1ee9c c\u00f4ng ngh\u1ec7 - 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