{"id":569100,"date":"2026-07-27T09:32:59","date_gmt":"2026-07-27T02:32:59","guid":{"rendered":"https:\/\/hoanghamobile.com\/tin-tuc\/?p=569100"},"modified":"2026-08-25T16:12:37","modified_gmt":"2026-08-25T09:12:37","slug":"dien-tich-toan-phan-hinh-lap-phuong","status":"publish","type":"post","link":"https:\/\/hoanghamobile.com\/tin-tuc\/dien-tich-toan-phan-hinh-lap-phuong\/","title":{"rendered":"Di\u1ec7n t\u00edch to\u00e0n ph\u1ea7n h\u00ecnh l\u1eadp ph\u01b0\u01a1ng: c\u00f4ng th\u1ee9c Stp = 6a\u00b2"},"content":{"rendered":"<p><strong>Di\u1ec7n t\u00edch to\u00e0n ph\u1ea7n h\u00ecnh l\u1eadp ph\u01b0\u01a1ng b\u1eb1ng s\u00e1u l\u1ea7n di\u1ec7n t\u00edch m\u1ed9t m\u1eb7t, t\u00ednh theo c\u00f4ng th\u1ee9c S<sub>tp<\/sub> = 6 \u00d7 a\u00b2, trong \u0111\u00f3 a l\u00e0 \u0111\u1ed9 d\u00e0i m\u1ed9t c\u1ea1nh.<\/strong> V\u00ec h\u00ecnh l\u1eadp ph\u01b0\u01a1ng c\u00f3 s\u00e1u m\u1eb7t \u0111\u1ec1u l\u00e0 h\u00ecnh vu\u00f4ng b\u1eb1ng nhau n\u00ean di\u1ec7n t\u00edch to\u00e0n ph\u1ea7n b\u1eb1ng t\u1ed5ng di\u1ec7n t\u00edch c\u1ee7a c\u1ea3 s\u00e1u m\u1eb7t \u0111\u00f3. \u0110\u00e2y l\u00e0 ki\u1ebfn th\u1ee9c h\u00ecnh h\u1ecdc kh\u00f4ng gian c\u01a1 b\u1ea3n m\u00e0 b\u1ea1n th\u01b0\u1eddng g\u1eb7p \u1edf ch\u01b0\u01a1ng tr\u00ecnh l\u1edbp 5 v\u00e0 l\u1edbp 12. N\u1ed9i dung d\u01b0\u1edbi \u0111\u00e2y tr\u00ecnh b\u00e0y c\u00f4ng th\u1ee9c di\u1ec7n t\u00edch to\u00e0n ph\u1ea7n, di\u1ec7n t\u00edch xung quanh, b\u1ea3ng tra nhanh, nhi\u1ec1u v\u00ed d\u1ee5 v\u00e0 b\u00e0i t\u1eadp c\u00f3 l\u1eddi gi\u1ea3i t\u1eebng b\u01b0\u1edbc, c\u00f9ng c\u00e1ch ph\u00e2n bi\u1ec7t v\u1edbi th\u1ec3 t\u00edch \u0111\u1ec3 b\u1ea1n kh\u00f4ng nh\u1ea7m l\u1eabn.<\/p>\n<h2>H\u00ecnh l\u1eadp ph\u01b0\u01a1ng v\u00e0 c\u00e1c m\u1eb7t<\/h2>\n<p>H\u00ecnh l\u1eadp ph\u01b0\u01a1ng l\u00e0 h\u00ecnh kh\u1ed1i c\u00f3 s\u00e1u m\u1eb7t \u0111\u1ec1u l\u00e0 h\u00ecnh vu\u00f4ng b\u1eb1ng nhau, 8 \u0111\u1ec9nh v\u00e0 12 c\u1ea1nh c\u00f3 \u0111\u1ed9 d\u00e0i b\u1eb1ng nhau. V\u00ec t\u1ea5t c\u1ea3 c\u00e1c m\u1eb7t l\u00e0 h\u00ecnh vu\u00f4ng c\u1ea1nh a n\u00ean di\u1ec7n t\u00edch m\u1ed7i m\u1eb7t b\u1eb1ng a\u00b2. \u0110\u00e2y l\u00e0 c\u01a1 s\u1edf \u0111\u1ec3 t\u00ednh di\u1ec7n t\u00edch xung quanh v\u00e0 di\u1ec7n t\u00edch to\u00e0n ph\u1ea7n c\u1ee7a h\u00ecnh l\u1eadp ph\u01b0\u01a1ng. B\u1ea1n ch\u1ec9 c\u1ea7n bi\u1ebft \u0111\u1ed9 d\u00e0i m\u1ed9t c\u1ea1nh l\u00e0 c\u00f3 th\u1ec3 suy ra \u0111\u01b0\u1ee3c m\u1ecdi \u0111\u1ea1i l\u01b0\u1ee3ng c\u00f2n l\u1ea1i c\u1ee7a kh\u1ed1i.<\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter size-full wp-image-569111\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dien-tich-toan-phan-hinh-lap-phuong-1.jpg\" alt=\"H\u00ecnh l\u1eadp ph\u01b0\u01a1ng v\u00e0 c\u00e1c m\u1eb7t\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dien-tich-toan-phan-hinh-lap-phuong-1.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dien-tich-toan-phan-hinh-lap-phuong-1-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dien-tich-toan-phan-hinh-lap-phuong-1-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>C\u00f4ng th\u1ee9c di\u1ec7n t\u00edch to\u00e0n ph\u1ea7n h\u00ecnh l\u1eadp ph\u01b0\u01a1ng<\/h2>\n<p>Di\u1ec7n t\u00edch to\u00e0n ph\u1ea7n b\u1eb1ng t\u1ed5ng di\u1ec7n t\u00edch c\u1ee7a c\u1ea3 s\u00e1u m\u1eb7t:<\/p>\n<p><strong>S<sub>tp<\/sub> = 6 \u00d7 a\u00b2<\/strong><\/p>\n<ul>\n<li>S<sub>tp<\/sub>: di\u1ec7n t\u00edch to\u00e0n ph\u1ea7n.<\/li>\n<li>a: \u0111\u1ed9 d\u00e0i m\u1ed9t c\u1ea1nh c\u1ee7a h\u00ecnh l\u1eadp ph\u01b0\u01a1ng.<\/li>\n<\/ul>\n<p>\u0110\u01a1n v\u1ecb c\u1ee7a di\u1ec7n t\u00edch l\u00e0 \u0111\u01a1n v\u1ecb d\u00e0i b\u00ecnh ph\u01b0\u01a1ng, v\u00ed d\u1ee5 cm\u00b2, dm\u00b2, m\u00b2. M\u1ed9t l\u01b0u \u00fd quan tr\u1ecdng: tr\u01b0\u1edbc khi thay s\u1ed1 v\u00e0o c\u00f4ng th\u1ee9c, b\u1ea1n c\u1ea7n \u0111\u01b0a t\u1ea5t c\u1ea3 c\u00e1c c\u1ea1nh v\u1ec1 c\u00f9ng m\u1ed9t \u0111\u01a1n v\u1ecb \u0111o. N\u1ebfu \u0111\u1ec1 cho c\u1ea1nh b\u1eb1ng m\u00e9t th\u00ec k\u1ebft qu\u1ea3 s\u1ebd t\u00ednh theo m\u00b2, n\u1ebfu cho b\u1eb1ng x\u0103ng-ti-m\u00e9t th\u00ec k\u1ebft qu\u1ea3 theo cm\u00b2.<\/p>\n<h2>Di\u1ec7n t\u00edch xung quanh h\u00ecnh l\u1eadp ph\u01b0\u01a1ng<\/h2>\n<p>Di\u1ec7n t\u00edch xung quanh c\u1ee7a h\u00ecnh l\u1eadp ph\u01b0\u01a1ng b\u1eb1ng t\u1ed5ng di\u1ec7n t\u00edch b\u1ed1n m\u1eb7t b\u00ean (kh\u00f4ng t\u00ednh hai m\u1eb7t \u0111\u00e1y):<\/p>\n<p><strong>S<sub>xq<\/sub> = 4 \u00d7 a\u00b2<\/strong><\/p>\n<p>Nh\u01b0 v\u1eady, di\u1ec7n t\u00edch to\u00e0n ph\u1ea7n b\u1eb1ng di\u1ec7n t\u00edch xung quanh c\u1ed9ng di\u1ec7n t\u00edch hai m\u1eb7t \u0111\u00e1y: S<sub>tp<\/sub> = S<sub>xq<\/sub> + 2a\u00b2 = 4a\u00b2 + 2a\u00b2 = 6a\u00b2. C\u00e1ch hi\u1ec3u n\u00e0y gi\u00fap b\u1ea1n ghi nh\u1edb c\u00f4ng th\u1ee9c m\u1ed9t c\u00e1ch logic thay v\u00ec h\u1ecdc thu\u1ed9c l\u00f2ng m\u00e1y m\u00f3c.<\/p>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-569112\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dien-tich-toan-phan-hinh-lap-phuong-2.jpg\" alt=\"Di\u1ec7n t\u00edch xung quanh h\u00ecnh l\u1eadp ph\u01b0\u01a1ng\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dien-tich-toan-phan-hinh-lap-phuong-2.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dien-tich-toan-phan-hinh-lap-phuong-2-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dien-tich-toan-phan-hinh-lap-phuong-2-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>B\u1ea3ng c\u00f4ng th\u1ee9c tra nhanh h\u00ecnh l\u1eadp ph\u01b0\u01a1ng<\/h2>\n<p>B\u1ea3ng d\u01b0\u1edbi \u0111\u00e2y t\u1ed5ng h\u1ee3p c\u00e1c c\u00f4ng th\u1ee9c quan tr\u1ecdng c\u1ee7a h\u00ecnh l\u1eadp ph\u01b0\u01a1ng c\u1ea1nh a \u0111\u1ec3 b\u1ea1n tra c\u1ee9u nhanh khi l\u00e0m b\u00e0i:<\/p>\n<table>\n<thead>\n<tr>\n<th>\u0110\u1ea1i l\u01b0\u1ee3ng<\/th>\n<th>C\u00f4ng th\u1ee9c<\/th>\n<th>\u0110\u01a1n v\u1ecb<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Di\u1ec7n t\u00edch m\u1ed9t m\u1eb7t<\/td>\n<td>a\u00b2<\/td>\n<td>cm\u00b2, m\u00b2&#8230;<\/td>\n<\/tr>\n<tr>\n<td>Di\u1ec7n t\u00edch xung quanh<\/td>\n<td>S<sub>xq<\/sub> = 4a\u00b2<\/td>\n<td>cm\u00b2, m\u00b2&#8230;<\/td>\n<\/tr>\n<tr>\n<td>Di\u1ec7n t\u00edch to\u00e0n ph\u1ea7n<\/td>\n<td>S<sub>tp<\/sub> = 6a\u00b2<\/td>\n<td>cm\u00b2, m\u00b2&#8230;<\/td>\n<\/tr>\n<tr>\n<td>Th\u1ec3 t\u00edch<\/td>\n<td>V = a\u00b3<\/td>\n<td>cm\u00b3, m\u00b3&#8230;<\/td>\n<\/tr>\n<tr>\n<td>\u0110\u1ed9 d\u00e0i m\u1ed9t c\u1ea1nh (t\u1eeb S<sub>tp<\/sub>)<\/td>\n<td>a = \u221a(S<sub>tp<\/sub> \/ 6)<\/td>\n<td>cm, m&#8230;<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>V\u00ed d\u1ee5 t\u00ednh di\u1ec7n t\u00edch to\u00e0n ph\u1ea7n<\/h2>\n<p>D\u01b0\u1edbi \u0111\u00e2y l\u00e0 c\u00e1c v\u00ed d\u1ee5 c\u01a1 b\u1ea3n gi\u00fap b\u1ea1n l\u00e0m quen v\u1edbi c\u00f4ng th\u1ee9c tr\u01b0\u1edbc khi v\u00e0o ph\u1ea7n b\u00e0i t\u1eadp:<\/p>\n<ul>\n<li><strong>V\u00ed d\u1ee5 1:<\/strong> H\u00ecnh l\u1eadp ph\u01b0\u01a1ng c\u1ea1nh 3 cm c\u00f3 di\u1ec7n t\u00edch to\u00e0n ph\u1ea7n S<sub>tp<\/sub> = 6 \u00d7 3\u00b2 = 6 \u00d7 9 = 54 cm\u00b2.<\/li>\n<li><strong>V\u00ed d\u1ee5 2:<\/strong> H\u00ecnh l\u1eadp ph\u01b0\u01a1ng c\u1ea1nh 5 cm c\u00f3 di\u1ec7n t\u00edch xung quanh S<sub>xq<\/sub> = 4 \u00d7 5\u00b2 = 100 cm\u00b2 v\u00e0 di\u1ec7n t\u00edch to\u00e0n ph\u1ea7n S<sub>tp<\/sub> = 6 \u00d7 25 = 150 cm\u00b2.<\/li>\n<\/ul>\n<h2>B\u00e0i t\u1eadp v\u1eadn d\u1ee5ng c\u00f3 l\u1eddi gi\u1ea3i<\/h2>\n<p>H\u00e3y th\u1eed t\u1ef1 gi\u1ea3i tr\u01b0\u1edbc khi xem l\u1eddi gi\u1ea3i chi ti\u1ebft t\u1eebng b\u01b0\u1edbc \u1edf b\u00ean d\u01b0\u1edbi:<\/p>\n<ul>\n<li><strong>B\u00e0i 1:<\/strong> T\u00ednh di\u1ec7n t\u00edch to\u00e0n ph\u1ea7n c\u1ee7a h\u00ecnh l\u1eadp ph\u01b0\u01a1ng c\u1ea1nh 4 cm.<br \/>\n<em>L\u1eddi gi\u1ea3i:<\/em> B\u01b0\u1edbc 1 \u2013 x\u00e1c \u0111\u1ecbnh c\u1ea1nh a = 4 cm. B\u01b0\u1edbc 2 \u2013 t\u00ednh di\u1ec7n t\u00edch m\u1ed9t m\u1eb7t a\u00b2 = 4\u00b2 = 16 cm\u00b2. B\u01b0\u1edbc 3 \u2013 nh\u00e2n v\u1edbi 6: S<sub>tp<\/sub> = 6 \u00d7 16 = 96 cm\u00b2.<\/li>\n<li><strong>B\u00e0i 2:<\/strong> M\u1ed9t h\u00ecnh l\u1eadp ph\u01b0\u01a1ng c\u00f3 di\u1ec7n t\u00edch to\u00e0n ph\u1ea7n 96 cm\u00b2. T\u00ednh \u0111\u1ed9 d\u00e0i c\u1ea1nh.<br \/>\n<em>L\u1eddi gi\u1ea3i:<\/em> B\u01b0\u1edbc 1 \u2013 t\u1eeb c\u00f4ng th\u1ee9c 6a\u00b2 = 96. B\u01b0\u1edbc 2 \u2013 suy ra a\u00b2 = 96 : 6 = 16. B\u01b0\u1edbc 3 \u2013 l\u1ea5y c\u0103n b\u1eadc hai: a = \u221a16 = 4 cm.<\/li>\n<li><strong>B\u00e0i 3:<\/strong> T\u00ednh di\u1ec7n t\u00edch xung quanh h\u00ecnh l\u1eadp ph\u01b0\u01a1ng c\u1ea1nh 6 cm.<br \/>\n<em>L\u1eddi gi\u1ea3i:<\/em> B\u01b0\u1edbc 1 \u2013 a = 6 cm n\u00ean a\u00b2 = 36 cm\u00b2. B\u01b0\u1edbc 2 \u2013 S<sub>xq<\/sub> = 4 \u00d7 36 = 144 cm\u00b2.<\/li>\n<li><strong>B\u00e0i 4:<\/strong> C\u1ea7n bao nhi\u00eau gi\u1ea5y \u0111\u1ec3 d\u00e1n k\u00edn m\u1ed9t h\u1ed9p l\u1eadp ph\u01b0\u01a1ng c\u1ea1nh 2 dm?<br \/>\n<em>L\u1eddi gi\u1ea3i:<\/em> D\u00e1n k\u00edn c\u1ea3 h\u1ed9p t\u1ee9c l\u00e0 t\u00ednh di\u1ec7n t\u00edch to\u00e0n ph\u1ea7n. S<sub>tp<\/sub> = 6 \u00d7 2\u00b2 = 6 \u00d7 4 = 24 dm\u00b2, n\u00ean c\u1ea7n 24 dm\u00b2 gi\u1ea5y.<\/li>\n<li><strong>B\u00e0i 5:<\/strong> M\u1ed9t b\u1ec3 k\u00ednh h\u00ecnh l\u1eadp ph\u01b0\u01a1ng (kh\u00f4ng n\u1eafp) c\u1ea1nh 5 dm. T\u00ednh di\u1ec7n t\u00edch k\u00ednh c\u1ea7n d\u00f9ng.<br \/>\n<em>L\u1eddi gi\u1ea3i:<\/em> B\u1ec3 kh\u00f4ng n\u1eafp g\u1ed3m 4 m\u1eb7t xung quanh v\u00e0 1 m\u1eb7t \u0111\u00e1y, t\u1ee9c 5 m\u1eb7t. Di\u1ec7n t\u00edch m\u1ed9t m\u1eb7t = 5\u00b2 = 25 dm\u00b2. V\u1eady di\u1ec7n t\u00edch k\u00ednh = 5 \u00d7 25 = 125 dm\u00b2.<\/li>\n<li><strong>B\u00e0i 6 (tr\u1eafc nghi\u1ec7m):<\/strong> Di\u1ec7n t\u00edch to\u00e0n ph\u1ea7n kh\u1ed1i l\u1eadp ph\u01b0\u01a1ng c\u1ea1nh 10 cm l\u00e0 bao nhi\u00eau? A. 100 B. 600 C. 400 D. 1000.<br \/>\n<em>\u0110\u00e1p \u00e1n:<\/em> B, v\u00ec S<sub>tp<\/sub> = 6 \u00d7 10\u00b2 = 6 \u00d7 100 = 600 cm\u00b2.<\/li>\n<\/ul>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-569113\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dien-tich-toan-phan-hinh-lap-phuong-3.jpg\" alt=\"Di\u1ec7n t\u00edch to\u00e0n ph\u1ea7n h\u00ecnh l\u1eadp ph\u01b0\u01a1ng: c\u00f4ng th\u1ee9c Stp = 6a\u00b2 - b\u00e0i t\u1eadp v\u1eadn d\u1ee5ng c\u00f3 l\u1eddi gi\u1ea3i\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dien-tich-toan-phan-hinh-lap-phuong-3.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dien-tich-toan-phan-hinh-lap-phuong-3-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dien-tich-toan-phan-hinh-lap-phuong-3-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>\u1ee8ng d\u1ee5ng c\u1ee7a di\u1ec7n t\u00edch to\u00e0n ph\u1ea7n<\/h2>\n<p>C\u00f4ng th\u1ee9c di\u1ec7n t\u00edch to\u00e0n ph\u1ea7n kh\u1ed1i l\u1eadp ph\u01b0\u01a1ng \u0111\u01b0\u1ee3c d\u00f9ng nhi\u1ec1u trong th\u1ef1c t\u1ebf: t\u00ednh l\u01b0\u1ee3ng gi\u1ea5y ho\u1eb7c s\u01a1n c\u1ea7n \u0111\u1ec3 b\u1ecdc, s\u01a1n m\u1ed9t h\u1ed9p hay kh\u1ed1i vu\u00f4ng; t\u00ednh di\u1ec7n t\u00edch k\u00ednh cho b\u1ec3 c\u00e1 h\u00ecnh l\u1eadp ph\u01b0\u01a1ng; \u01b0\u1edbc l\u01b0\u1ee3ng v\u1eadt li\u1ec7u b\u1ec1 m\u1eb7t trong x\u00e2y d\u1ef1ng v\u00e0 \u0111\u00f3ng g\u00f3i. Khi g\u1eb7p b\u00e0i to\u00e1n th\u1ef1c t\u1ebf, ch\u1ec9 c\u1ea7n x\u00e1c \u0111\u1ecbnh \u0111\u1ed9 d\u00e0i c\u1ea1nh a r\u1ed3i \u00e1p d\u1ee5ng S<sub>tp<\/sub> = 6a\u00b2 (ho\u1eb7c S<sub>xq<\/sub> = 4a\u00b2 n\u1ebfu ch\u1ec9 t\u00ednh ph\u1ea7n m\u1eb7t xung quanh). V\u1edbi nh\u1eefng b\u00e0i \u0111\u1eb7c bi\u1ec7t nh\u01b0 h\u1ed9p kh\u00f4ng n\u1eafp hay b\u1ec3 c\u00e1 h\u1edf, b\u1ea1n c\u1ea7n \u0111\u1ecdc k\u1ef9 \u0111\u1ec1 \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh \u0111\u00fang s\u1ed1 m\u1eb7t c\u1ea7n t\u00ednh, tr\u00e1nh c\u1ed9ng d\u01b0 ho\u1eb7c thi\u1ebfu m\u1eb7t.<\/p>\n<h2>Nh\u1eefng l\u1ed7i th\u01b0\u1eddng g\u1eb7p khi t\u00ednh<\/h2>\n<p>Khi gi\u1ea3i b\u00e0i to\u00e1n v\u1ec1 h\u00ecnh l\u1eadp ph\u01b0\u01a1ng, h\u1ecdc sinh hay m\u1eafc m\u1ed9t s\u1ed1 l\u1ed7i sau:<\/p>\n<ul>\n<li><strong>Nh\u1ea7m nh\u00e2n v\u1edbi 4 thay v\u00ec 6:<\/strong> nh\u1edb r\u1eb1ng di\u1ec7n t\u00edch to\u00e0n ph\u1ea7n d\u00f9ng h\u1ec7 s\u1ed1 6, c\u00f2n di\u1ec7n t\u00edch xung quanh m\u1edbi d\u00f9ng h\u1ec7 s\u1ed1 4.<\/li>\n<li><strong>Qu\u00ean b\u00ecnh ph\u01b0\u01a1ng c\u1ea1nh:<\/strong> ph\u1ea3i t\u00ednh a\u00b2 tr\u01b0\u1edbc r\u1ed3i m\u1edbi nh\u00e2n v\u1edbi 6, kh\u00f4ng nh\u00e2n th\u1eb3ng 6 \u00d7 a.<\/li>\n<li><strong>Sai \u0111\u01a1n v\u1ecb:<\/strong> di\u1ec7n t\u00edch lu\u00f4n c\u00f3 \u0111\u01a1n v\u1ecb b\u00ecnh ph\u01b0\u01a1ng (cm\u00b2, m\u00b2), kh\u00e1c v\u1edbi th\u1ec3 t\u00edch l\u00e0 l\u0169y th\u1eeba ba.<\/li>\n<li><strong>T\u00ednh \u0111\u1ee7 6 m\u1eb7t cho h\u1ed9p h\u1edf:<\/strong> v\u1edbi h\u1ed9p ho\u1eb7c b\u1ec3 kh\u00f4ng n\u1eafp ch\u1ec9 t\u00ednh 5 m\u1eb7t, kh\u00f4ng t\u00ednh \u0111\u1ee7 6 m\u1eb7t.<\/li>\n<\/ul>\n<h2>Ph\u00e2n bi\u1ec7t di\u1ec7n t\u00edch to\u00e0n ph\u1ea7n v\u00e0 th\u1ec3 t\u00edch<\/h2>\n<p>Di\u1ec7n t\u00edch to\u00e0n ph\u1ea7n (S<sub>tp<\/sub> = 6a\u00b2) \u0111o ph\u1ea7n b\u1ec1 m\u1eb7t b\u00ean ngo\u00e0i c\u1ee7a kh\u1ed1i l\u1eadp ph\u01b0\u01a1ng, c\u00f3 \u0111\u01a1n v\u1ecb l\u00e0 \u0111\u01a1n v\u1ecb d\u00e0i b\u00ecnh ph\u01b0\u01a1ng (cm\u00b2, m\u00b2). C\u00f2n th\u1ec3 t\u00edch (V = a\u00b3) \u0111o ph\u1ea7n kh\u00f4ng gian m\u00e0 h\u00ecnh l\u1eadp ph\u01b0\u01a1ng chi\u1ebfm, c\u00f3 \u0111\u01a1n v\u1ecb l\u00e0 \u0111\u01a1n v\u1ecb d\u00e0i l\u0169y th\u1eeba ba (cm\u00b3, m\u00b3). Hai \u0111\u1ea1i l\u01b0\u1ee3ng n\u00e0y kh\u00e1c nhau v\u1ec1 \u00fd ngh\u0129a v\u00e0 \u0111\u01a1n v\u1ecb, c\u1ea7n tr\u00e1nh nh\u1ea7m l\u1eabn khi l\u00e0m b\u00e0i. V\u00ed d\u1ee5 h\u00ecnh l\u1eadp ph\u01b0\u01a1ng c\u1ea1nh 2 cm c\u00f3 di\u1ec7n t\u00edch to\u00e0n ph\u1ea7n 24 cm\u00b2 nh\u01b0ng th\u1ec3 t\u00edch ch\u1ec9 8 cm\u00b3 \u2013 hai con s\u1ed1 ho\u00e0n to\u00e0n kh\u00e1c nhau.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-569114\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dien-tich-toan-phan-hinh-lap-phuong-4.jpg\" alt=\"Ph\u00e2n bi\u1ec7t di\u1ec7n t\u00edch to\u00e0n ph\u1ea7n v\u00e0 th\u1ec3 t\u00edch\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dien-tich-toan-phan-hinh-lap-phuong-4.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dien-tich-toan-phan-hinh-lap-phuong-4-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dien-tich-toan-phan-hinh-lap-phuong-4-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p v\u1ec1 di\u1ec7n t\u00edch to\u00e0n ph\u1ea7n kh\u1ed1i l\u1eadp ph\u01b0\u01a1ng<\/h2>\n<h3>C\u00f4ng th\u1ee9c di\u1ec7n t\u00edch to\u00e0n ph\u1ea7n c\u1ee7a h\u00ecnh l\u1eadp ph\u01b0\u01a1ng l\u00e0 g\u00ec?<\/h3>\n<p>S<sub>tp<\/sub> = 6 \u00d7 a\u00b2, b\u1eb1ng s\u00e1u l\u1ea7n di\u1ec7n t\u00edch m\u1ed9t m\u1eb7t.<\/p>\n<h3>Di\u1ec7n t\u00edch xung quanh h\u00ecnh l\u1eadp ph\u01b0\u01a1ng t\u00ednh th\u1ebf n\u00e0o?<\/h3>\n<p>S<sub>xq<\/sub> = 4 \u00d7 a\u00b2, b\u1eb1ng t\u1ed5ng di\u1ec7n t\u00edch b\u1ed1n m\u1eb7t b\u00ean.<\/p>\n<h3>Di\u1ec7n t\u00edch m\u1ed9t m\u1eb7t h\u00ecnh l\u1eadp ph\u01b0\u01a1ng l\u00e0 bao nhi\u00eau?<\/h3>\n<p>B\u1eb1ng a\u00b2, v\u1edbi a l\u00e0 \u0111\u1ed9 d\u00e0i c\u1ea1nh.<\/p>\n<h3>C\u00e1ch t\u00ecm c\u1ea1nh khi bi\u1ebft di\u1ec7n t\u00edch to\u00e0n ph\u1ea7n?<\/h3>\n<p>T\u1eeb 6a\u00b2 = S<sub>tp<\/sub> suy ra a\u00b2 = S<sub>tp<\/sub>\/6, r\u1ed3i l\u1ea5y c\u0103n b\u1eadc hai \u0111\u1ec3 c\u00f3 a.<\/p>\n<h3>Di\u1ec7n t\u00edch to\u00e0n ph\u1ea7n kh\u00e1c th\u1ec3 t\u00edch th\u1ebf n\u00e0o?<\/h3>\n<p>Di\u1ec7n t\u00edch to\u00e0n ph\u1ea7n \u0111o b\u1ec1 m\u1eb7t (\u0111\u01a1n v\u1ecb b\u00ecnh ph\u01b0\u01a1ng), th\u1ec3 t\u00edch \u0111o kh\u00f4ng gian chi\u1ebfm ch\u1ed7 (\u0111\u01a1n v\u1ecb l\u0169y th\u1eeba ba).<\/p>\n<h3>T\u00ednh di\u1ec7n t\u00edch h\u1ed9p l\u1eadp ph\u01b0\u01a1ng kh\u00f4ng c\u00f3 n\u1eafp th\u1ebf n\u00e0o?<\/h3>\n<p>H\u1ed9p kh\u00f4ng n\u1eafp ch\u1ec9 c\u00f3 5 m\u1eb7t, n\u00ean di\u1ec7n t\u00edch b\u1eb1ng 5 \u00d7 a\u00b2 thay v\u00ec 6 \u00d7 a\u00b2.<\/p>\n<p><script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"C\u00f4ng th\u1ee9c di\u1ec7n t\u00edch to\u00e0n ph\u1ea7n h\u00ecnh l\u1eadp ph\u01b0\u01a1ng l\u00e0 g\u00ec?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Stp = 6 nh\u00e2n a b\u00ecnh ph\u01b0\u01a1ng, b\u1eb1ng s\u00e1u l\u1ea7n di\u1ec7n t\u00edch m\u1ed9t m\u1eb7t.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Di\u1ec7n t\u00edch xung quanh h\u00ecnh l\u1eadp ph\u01b0\u01a1ng t\u00ednh th\u1ebf n\u00e0o?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Sxq = 4 nh\u00e2n a b\u00ecnh ph\u01b0\u01a1ng, b\u1eb1ng t\u1ed5ng di\u1ec7n t\u00edch b\u1ed1n m\u1eb7t b\u00ean.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Di\u1ec7n t\u00edch m\u1ed9t m\u1eb7t h\u00ecnh l\u1eadp ph\u01b0\u01a1ng l\u00e0 bao nhi\u00eau?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"B\u1eb1ng a b\u00ecnh ph\u01b0\u01a1ng, v\u1edbi a l\u00e0 \u0111\u1ed9 d\u00e0i c\u1ea1nh.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"C\u00e1ch t\u00ecm c\u1ea1nh khi bi\u1ebft di\u1ec7n t\u00edch to\u00e0n ph\u1ea7n?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"T\u1eeb 6a b\u00ecnh ph\u01b0\u01a1ng = Stp suy ra a b\u00ecnh ph\u01b0\u01a1ng = Stp chia 6, r\u1ed3i l\u1ea5y c\u0103n b\u1eadc hai \u0111\u1ec3 c\u00f3 a.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Di\u1ec7n t\u00edch to\u00e0n ph\u1ea7n kh\u00e1c th\u1ec3 t\u00edch th\u1ebf n\u00e0o?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Di\u1ec7n t\u00edch to\u00e0n ph\u1ea7n \u0111o b\u1ec1 m\u1eb7t (\u0111\u01a1n v\u1ecb b\u00ecnh ph\u01b0\u01a1ng), th\u1ec3 t\u00edch \u0111o kh\u00f4ng gian chi\u1ebfm ch\u1ed7 (\u0111\u01a1n v\u1ecb l\u0169y th\u1eeba ba).\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"T\u00ednh di\u1ec7n t\u00edch h\u1ed9p l\u1eadp ph\u01b0\u01a1ng kh\u00f4ng c\u00f3 n\u1eafp th\u1ebf n\u00e0o?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"H\u1ed9p kh\u00f4ng n\u1eafp ch\u1ec9 c\u00f3 5 m\u1eb7t, n\u00ean di\u1ec7n t\u00edch b\u1eb1ng 5 nh\u00e2n a b\u00ecnh ph\u01b0\u01a1ng thay v\u00ec 6 nh\u00e2n a b\u00ecnh ph\u01b0\u01a1ng.\"\n      }\n    }\n  ]\n}\n<\/script><\/p>\n<h2>K\u1ebft lu\u1eadn<\/h2>\n<p>T\u00f3m l\u1ea1i, <strong>di\u1ec7n t\u00edch to\u00e0n ph\u1ea7n h\u00ecnh l\u1eadp ph\u01b0\u01a1ng b\u1eb1ng S<sub>tp<\/sub> = 6a\u00b2, c\u00f2n di\u1ec7n t\u00edch xung quanh b\u1eb1ng S<sub>xq<\/sub> = 4a\u00b2<\/strong>. Ghi nh\u1edb hai c\u00f4ng th\u1ee9c n\u00e0y v\u00e0 ph\u00e2n bi\u1ec7t v\u1edbi th\u1ec3 t\u00edch V = a\u00b3 s\u1ebd gi\u00fap b\u1ea1n gi\u1ea3i nhanh c\u00e1c b\u00e0i to\u00e1n h\u00ecnh h\u1ecdc kh\u00f4ng gian. \u0110\u1ec3 h\u1ecdc th\u00eam, m\u1eddi b\u1ea1n tham kh\u1ea3o c\u00e1c b\u00e0i c\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch tam gi\u00e1c, c\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch h\u00ecnh tr\u00f2n v\u00e0 1 l\u00edt b\u1eb1ng bao nhi\u00eau ml tr\u00ean chuy\u00ean m\u1ee5c tin t\u1ee9c c\u1ee7a Ho\u00e0ng H\u00e0 Mobile.<\/p>\n<p>Xem th\u00eam:<\/p>\n<ul>\n<li><a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/dien-tich-hinh-thoi\/\">Di\u1ec7n t\u00edch h\u00ecnh thoi: c\u00f4ng th\u1ee9c, c\u00e1ch t\u00ednh v\u00e0 v\u00ed d\u1ee5<\/a><\/li>\n<li><a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/duong-tron-la-gi\/\">\u0110\u01b0\u1eddng tr\u00f2n l\u00e0 g\u00ec? Y\u1ebfu t\u1ed1, chu vi, di\u1ec7n t\u00edch v\u00e0 ph\u01b0\u01a1ng tr\u00ecnh<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Di\u1ec7n t\u00edch to\u00e0n ph\u1ea7n h\u00ecnh l\u1eadp ph\u01b0\u01a1ng b\u1eb1ng s\u00e1u l\u1ea7n di\u1ec7n t\u00edch m\u1ed9t m\u1eb7t, t\u00ednh theo c\u00f4ng th\u1ee9c Stp = 6 \u00d7 a\u00b2, trong \u0111\u00f3 a l\u00e0 \u0111\u1ed9 d\u00e0i m\u1ed9t c\u1ea1nh. V\u00ec h\u00ecnh l\u1eadp ph\u01b0\u01a1ng c\u00f3 s\u00e1u m\u1eb7t \u0111\u1ec1u l\u00e0 h\u00ecnh vu\u00f4ng b\u1eb1ng nhau n\u00ean di\u1ec7n t\u00edch to\u00e0n ph\u1ea7n b\u1eb1ng t\u1ed5ng di\u1ec7n t\u00edch c\u1ee7a c\u1ea3 [&hellip;]<\/p>\n","protected":false},"author":102,"featured_media":569117,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"di\u1ec7n t\u00edch to\u00e0n ph\u1ea7n h\u00ecnh l\u1eadp ph\u01b0\u01a1ng","_yoast_wpseo_title":"Di\u1ec7n t\u00edch to\u00e0n ph\u1ea7n h\u00ecnh l\u1eadp ph\u01b0\u01a1ng: c\u00f4ng th\u1ee9c Stp = 6a\u00b2","_yoast_wpseo_metadesc":"Di\u1ec7n t\u00edch to\u00e0n ph\u1ea7n h\u00ecnh l\u1eadp ph\u01b0\u01a1ng t\u00ednh theo c\u00f4ng th\u1ee9c Stp = 6a\u00b2, k\u00e8m v\u00ed d\u1ee5 v\u00e0 b\u00e0i t\u1eadp c\u00f3 l\u1eddi gi\u1ea3i. Xem chi ti\u1ebft t\u1ea1i Ho\u00e0ng H\u00e0 Mobile.","footnotes":""},"categories":[3910,30453],"tags":[],"class_list":["post-569100","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>Di\u1ec7n t\u00edch to\u00e0n ph\u1ea7n h\u00ecnh l\u1eadp ph\u01b0\u01a1ng: c\u00f4ng th\u1ee9c Stp = 6a\u00b2<\/title>\n<meta name=\"description\" content=\"Di\u1ec7n t\u00edch to\u00e0n ph\u1ea7n h\u00ecnh l\u1eadp ph\u01b0\u01a1ng t\u00ednh theo c\u00f4ng th\u1ee9c Stp = 6a\u00b2, k\u00e8m v\u00ed d\u1ee5 v\u00e0 b\u00e0i t\u1eadp c\u00f3 l\u1eddi gi\u1ea3i. Xem chi ti\u1ebft t\u1ea1i Ho\u00e0ng H\u00e0 Mobile.\" \/>\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-toan-phan-hinh-lap-phuong\/\" \/>\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 to\u00e0n ph\u1ea7n h\u00ecnh l\u1eadp ph\u01b0\u01a1ng: c\u00f4ng th\u1ee9c Stp = 6a\u00b2\" \/>\n<meta property=\"og:description\" content=\"Di\u1ec7n t\u00edch to\u00e0n ph\u1ea7n h\u00ecnh l\u1eadp ph\u01b0\u01a1ng t\u00ednh theo c\u00f4ng th\u1ee9c Stp = 6a\u00b2, k\u00e8m v\u00ed d\u1ee5 v\u00e0 b\u00e0i t\u1eadp c\u00f3 l\u1eddi gi\u1ea3i. 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