{"id":569538,"date":"2026-07-24T09:52:12","date_gmt":"2026-07-24T02:52:12","guid":{"rendered":"https:\/\/hoanghamobile.com\/tin-tuc\/?p=569538"},"modified":"2026-07-24T09:52:12","modified_gmt":"2026-07-24T02:52:12","slug":"hinh-thang","status":"publish","type":"post","link":"https:\/\/hoanghamobile.com\/tin-tuc\/hinh-thang\/","title":{"rendered":"H\u00ecnh thang l\u00e0 g\u00ec? C\u00e1c lo\u1ea1i, t\u00ednh ch\u1ea5t v\u00e0 c\u00f4ng th\u1ee9c t\u00ednh"},"content":{"rendered":"<p>H\u00ecnh thang l\u00e0 m\u1ed9t trong nh\u1eefng t\u1ee9 gi\u00e1c quen thu\u1ed9c nh\u1ea5t m\u00e0 b\u1ea1n g\u1eb7p t\u1eeb To\u00e1n l\u1edbp 5 \u0111\u1ebfn l\u1edbp 8. Ch\u1ec9 c\u1ea7n m\u1ed9t c\u1eb7p c\u1ea1nh \u0111\u1ed1i song song l\u00e0 b\u1ea1n \u0111\u00e3 c\u00f3 m\u1ed9t h\u00ecnh thang, th\u1ebf nh\u01b0ng xoay quanh h\u00ecnh n\u00e0y l\u1ea1i c\u00f3 kh\u00e1 nhi\u1ec1u \u0111i\u1ec1u \u0111\u00e1ng nh\u1edb: ba lo\u1ea1i h\u00ecnh thang kh\u00e1c nhau, m\u1ed9t lo\u1ea1t t\u00ednh ch\u1ea5t v\u1ec1 g\u00f3c v\u00e0 \u0111\u01b0\u1eddng ch\u00e9o, c\u00f9ng c\u00e1c c\u00f4ng th\u1ee9c t\u00ednh chu vi, di\u1ec7n t\u00edch v\u00e0 \u0111\u01b0\u1eddng trung b\u00ecnh. N\u1ebfu b\u1ea1n \u0111ang \u00f4n t\u1eadp ho\u1eb7c mu\u1ed1n gi\u1ea3i nhanh c\u00e1c b\u00e0i to\u00e1n h\u00ecnh h\u1ecdc, nh\u1eefng ki\u1ebfn th\u1ee9c \u0111\u01b0\u1ee3c h\u1ec7 th\u1ed1ng d\u01b0\u1edbi \u0111\u00e2y s\u1ebd gi\u00fap b\u1ea1n n\u1eafm ch\u1eafc v\u00e0 ghi nh\u1edb d\u1ec5 d\u00e0ng h\u01a1n.<\/p>\n<h2>H\u00ecnh thang l\u00e0 g\u00ec?<\/h2>\n<p>H\u00ecnh thang l\u00e0 t\u1ee9 gi\u00e1c c\u00f3 m\u1ed9t c\u1eb7p c\u1ea1nh \u0111\u1ed1i song song. Hai c\u1ea1nh song song n\u00e0y \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 hai \u0111\u00e1y (\u0111\u00e1y l\u1edbn v\u00e0 \u0111\u00e1y nh\u1ecf), c\u00f2n hai c\u1ea1nh c\u00f2n l\u1ea1i \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 c\u1ea1nh b\u00ean. Kho\u1ea3ng c\u00e1ch gi\u1eefa hai \u0111\u00e1y ch\u00ednh l\u00e0 chi\u1ec1u cao c\u1ee7a h\u00ecnh thang. \u0110\u00e2y l\u00e0 ki\u1ebfn th\u1ee9c n\u1ec1n t\u1ea3ng c\u1ee7a h\u00ecnh h\u1ecdc ph\u1eb3ng, xu\u1ea5t hi\u1ec7n xuy\u00ean su\u1ed1t ch\u01b0\u01a1ng tr\u00ecnh To\u00e1n l\u1edbp 5 v\u00e0 l\u1edbp 8, \u0111\u1ed3ng th\u1eddi l\u00e0 b\u01b0\u1edbc \u0111\u1ec7m \u0111\u1ec3 b\u1ea1n hi\u1ec3u c\u00e1c h\u00ecnh ph\u1ee9c t\u1ea1p h\u01a1n nh\u01b0 h\u00ecnh b\u00ecnh h\u00e0nh hay h\u00ecnh thoi.<\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"size-full wp-image-569967 aligncenter\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/hinh-thang-1.jpg\" alt=\"hinh-thang-1\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/hinh-thang-1.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/hinh-thang-1-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/hinh-thang-1-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>C\u00e1c lo\u1ea1i h\u00ecnh thang<\/h2>\n<p>D\u1ef1a v\u00e0o \u0111\u1eb7c \u0111i\u1ec3m c\u1ea1nh v\u00e0 g\u00f3c, h\u00ecnh thang \u0111\u01b0\u1ee3c chia th\u00e0nh ba lo\u1ea1i ch\u00ednh, m\u1ed7i lo\u1ea1i c\u00f3 d\u1ea5u hi\u1ec7u nh\u1eadn bi\u1ebft ri\u00eang.<\/p>\n<table>\n<thead>\n<tr>\n<th>Lo\u1ea1i h\u00ecnh thang<\/th>\n<th>\u0110\u1eb7c \u0111i\u1ec3m<\/th>\n<th>D\u1ea5u hi\u1ec7u nh\u1eadn bi\u1ebft<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>H\u00ecnh thang th\u01b0\u1eddng<\/td>\n<td>Ch\u1ec9 c\u00f3 hai c\u1ea1nh \u0111\u00e1y song song<\/td>\n<td>T\u1ee9 gi\u00e1c c\u00f3 \u0111\u00fang m\u1ed9t c\u1eb7p c\u1ea1nh \u0111\u1ed1i song song<\/td>\n<\/tr>\n<tr>\n<td>H\u00ecnh thang vu\u00f4ng<\/td>\n<td>C\u00f3 m\u1ed9t c\u1ea1nh b\u00ean vu\u00f4ng g\u00f3c v\u1edbi hai \u0111\u00e1y<\/td>\n<td>H\u00ecnh thang c\u00f3 \u00edt nh\u1ea5t m\u1ed9t g\u00f3c vu\u00f4ng (90\u00b0)<\/td>\n<\/tr>\n<tr>\n<td>H\u00ecnh thang c\u00e2n<\/td>\n<td>Hai c\u1ea1nh b\u00ean b\u1eb1ng nhau, hai g\u00f3c k\u1ec1 m\u1ed9t \u0111\u00e1y b\u1eb1ng nhau<\/td>\n<td>H\u00ecnh thang c\u00f3 hai \u0111\u01b0\u1eddng ch\u00e9o b\u1eb1ng nhau ho\u1eb7c hai g\u00f3c k\u1ec1 m\u1ed9t \u0111\u00e1y b\u1eb1ng nhau<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>Xem th\u00eam: <a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/don-thuc-la-gi\/\">\u0110\u01a1n th\u1ee9c l\u00e0 g\u00ec? \u0110\u01a1n th\u1ee9c thu g\u1ecdn, b\u1eadc v\u00e0 \u0111\u01a1n th\u1ee9c \u0111\u1ed3ng d\u1ea1ng<\/a><\/strong><\/p>\n<h2>T\u00ednh ch\u1ea5t c\u1ee7a h\u00ecnh thang<\/h2>\n<p>H\u00ecnh thang c\u00f3 nh\u1eefng t\u00ednh ch\u1ea5t \u0111\u1eb7c tr\u01b0ng v\u1ec1 c\u1ea1nh, g\u00f3c v\u00e0 \u0111\u01b0\u1eddng ch\u00e9o m\u00e0 b\u1ea1n c\u1ea7n ghi nh\u1edb \u0111\u1ec3 v\u1eadn d\u1ee5ng khi gi\u1ea3i b\u00e0i.<\/p>\n<ul>\n<li>Hai c\u1ea1nh \u0111\u00e1y song song v\u1edbi nhau.<\/li>\n<li>T\u1ed5ng hai g\u00f3c k\u1ec1 m\u1ed9t c\u1ea1nh b\u00ean b\u1eb1ng 180\u00b0.<\/li>\n<li>Trong h\u00ecnh thang c\u00e2n: hai c\u1ea1nh b\u00ean b\u1eb1ng nhau, hai \u0111\u01b0\u1eddng ch\u00e9o b\u1eb1ng nhau v\u00e0 hai g\u00f3c k\u1ec1 c\u00f9ng m\u1ed9t \u0111\u00e1y b\u1eb1ng nhau.<\/li>\n<li>\u0110\u01b0\u1eddng trung b\u00ecnh c\u1ee7a h\u00ecnh thang song song v\u1edbi hai \u0111\u00e1y v\u00e0 b\u1eb1ng n\u1eeda t\u1ed5ng hai \u0111\u00e1y.<\/li>\n<li>N\u1ebfu m\u1ed9t h\u00ecnh thang c\u00f3 hai c\u1ea1nh \u0111\u00e1y b\u1eb1ng nhau th\u00ec n\u00f3 tr\u1edf th\u00e0nh h\u00ecnh b\u00ecnh h\u00e0nh.<\/li>\n<\/ul>\n<p><img decoding=\"async\" class=\"size-full wp-image-569968 aligncenter\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/hinh-thang-2.jpg\" alt=\"hinh-thang-2\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/hinh-thang-2.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/hinh-thang-2-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/hinh-thang-2-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>\u0110\u01b0\u1eddng trung b\u00ecnh c\u1ee7a h\u00ecnh thang<\/h2>\n<p>\u0110\u01b0\u1eddng trung b\u00ecnh l\u00e0 \u0111o\u1ea1n th\u1eb3ng n\u1ed1i trung \u0111i\u1ec3m hai c\u1ea1nh b\u00ean, v\u00e0 n\u00f3 c\u00f3 m\u1ed9t c\u00f4ng th\u1ee9c r\u1ea5t g\u1ecdn \u0111\u1ec3 b\u1ea1n ghi nh\u1edb.<\/p>\n<ul>\n<li>\u0110\u01b0\u1eddng trung b\u00ecnh song song v\u1edbi hai \u0111\u00e1y.<\/li>\n<li>\u0110\u1ed9 d\u00e0i \u0111\u01b0\u1eddng trung b\u00ecnh b\u1eb1ng n\u1eeda t\u1ed5ng hai \u0111\u00e1y: m = (a + b) \/ 2.<\/li>\n<\/ul>\n<p><strong>V\u00ed d\u1ee5:<\/strong> H\u00ecnh thang c\u00f3 \u0111\u00e1y l\u1edbn 14 cm v\u00e0 \u0111\u00e1y nh\u1ecf 10 cm th\u00ec \u0111\u01b0\u1eddng trung b\u00ecnh m = (14 + 10) \/ 2 = 24 \/ 2 = 12 cm.<\/p>\n<h2>C\u00f4ng th\u1ee9c chu vi v\u00e0 di\u1ec7n t\u00edch h\u00ecnh thang<\/h2>\n<p>Hai c\u00f4ng th\u1ee9c quan tr\u1ecdng nh\u1ea5t c\u1ea7n thu\u1ed9c l\u00f2ng l\u00e0 chu vi v\u00e0 di\u1ec7n t\u00edch, \u0111\u01b0\u1ee3c t\u1ed5ng h\u1ee3p trong b\u1ea3ng d\u01b0\u1edbi \u0111\u00e2y.<\/p>\n<table>\n<thead>\n<tr>\n<th>\u0110\u1ea1i l\u01b0\u1ee3ng<\/th>\n<th>C\u00f4ng th\u1ee9c<\/th>\n<th>Ghi ch\u00fa<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Chu vi<\/td>\n<td>P = a + b + c + d<\/td>\n<td>T\u1ed5ng \u0111\u1ed9 d\u00e0i b\u1ed1n c\u1ea1nh c\u1ee7a h\u00ecnh thang<\/td>\n<\/tr>\n<tr>\n<td>Di\u1ec7n t\u00edch<\/td>\n<td>S = \u00bd \u00d7 (a + b) \u00d7 h<\/td>\n<td>a, b l\u00e0 hai \u0111\u00e1y; h l\u00e0 chi\u1ec1u cao<\/td>\n<\/tr>\n<tr>\n<td>\u0110\u01b0\u1eddng trung b\u00ecnh<\/td>\n<td>m = (a + b) \/ 2<\/td>\n<td>Suy ra S = m \u00d7 h<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><img decoding=\"async\" class=\"size-full wp-image-569969 aligncenter\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/hinh-thang-3.jpg\" alt=\"hinh-thang-3\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/hinh-thang-3.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/hinh-thang-3-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/hinh-thang-3-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>V\u00ed d\u1ee5 v\u00e0 b\u00e0i t\u1eadp v\u1eadn d\u1ee5ng c\u00f3 l\u1eddi gi\u1ea3i<\/h2>\n<p>D\u01b0\u1edbi \u0111\u00e2y l\u00e0 c\u00e1c d\u1ea1ng b\u00e0i th\u01b0\u1eddng g\u1eb7p k\u00e8m l\u1eddi gi\u1ea3i t\u1eebng b\u01b0\u1edbc \u0111\u1ec3 b\u1ea1n d\u1ec5 theo d\u00f5i.<\/p>\n<ul>\n<li><strong>B\u00e0i 1 (t\u00ednh di\u1ec7n t\u00edch):<\/strong> H\u00ecnh thang c\u00f3 hai \u0111\u00e1y 8 cm v\u00e0 12 cm, chi\u1ec1u cao 5 cm. B\u01b0\u1edbc 1: x\u00e1c \u0111\u1ecbnh a = 8, b = 12, h = 5. B\u01b0\u1edbc 2: \u00e1p d\u1ee5ng S = \u00bd \u00d7 (a + b) \u00d7 h = \u00bd \u00d7 (8 + 12) \u00d7 5. B\u01b0\u1edbc 3: t\u00ednh S = \u00bd \u00d7 20 \u00d7 5 = 50 cm\u00b2.<\/li>\n<li><strong>B\u00e0i 2 (t\u00ednh chu vi):<\/strong> H\u00ecnh thang c\u00f3 b\u1ed1n c\u1ea1nh 6 cm, 8 cm, 5 cm, 7 cm. B\u01b0\u1edbc 1: c\u1ed9ng \u0111\u1ed9 d\u00e0i b\u1ed1n c\u1ea1nh. B\u01b0\u1edbc 2: P = 6 + 8 + 5 + 7 = 26 cm.<\/li>\n<li><strong>B\u00e0i 3 (t\u00ecm chi\u1ec1u cao):<\/strong> Di\u1ec7n t\u00edch h\u00ecnh thang 60 cm\u00b2, hai \u0111\u00e1y 7 cm v\u00e0 13 cm. B\u01b0\u1edbc 1: t\u1eeb S = \u00bd \u00d7 (a + b) \u00d7 h suy ra h = 2S \/ (a + b). B\u01b0\u1edbc 2: h = (2 \u00d7 60) \/ (7 + 13) = 120 \/ 20 = 6 cm.<\/li>\n<li><strong>B\u00e0i 4 (t\u00ednh \u0111\u01b0\u1eddng trung b\u00ecnh):<\/strong> H\u00ecnh thang c\u00f3 \u0111\u00e1y l\u1edbn 16 cm, \u0111\u00e1y nh\u1ecf 9 cm. B\u01b0\u1edbc 1: \u00e1p d\u1ee5ng m = (a + b) \/ 2. B\u01b0\u1edbc 2: m = (16 + 9) \/ 2 = 25 \/ 2 = 12,5 cm.<\/li>\n<li><strong>B\u00e0i 5 (nh\u1eadn bi\u1ebft lo\u1ea1i h\u00ecnh thang):<\/strong> M\u1ed9t h\u00ecnh thang c\u00f3 hai \u0111\u01b0\u1eddng ch\u00e9o b\u1eb1ng nhau l\u00e0 h\u00ecnh thang g\u00ec? L\u1eddi gi\u1ea3i: d\u1ea5u hi\u1ec7u hai \u0111\u01b0\u1eddng ch\u00e9o b\u1eb1ng nhau cho bi\u1ebft \u0111\u00f3 l\u00e0 h\u00ecnh thang c\u00e2n.<\/li>\n<li><strong>B\u00e0i 6 (tr\u1eafc nghi\u1ec7m):<\/strong> H\u00ecnh thang c\u00f3 m\u1ed9t g\u00f3c vu\u00f4ng l\u00e0 h\u00ecnh thang g\u00ec? A. Th\u01b0\u1eddng B. Vu\u00f4ng C. C\u00e2n D. \u0110\u1ec1u. \u0110\u00e1p \u00e1n: B (h\u00ecnh thang vu\u00f4ng).<\/li>\n<\/ul>\n<p><strong>Xem th\u00eam: <a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/ham-so-la-gi\/\">H\u00e0m s\u1ed1 l\u00e0 g\u00ec? Kh\u00e1i ni\u1ec7m, t\u1eadp x\u00e1c \u0111\u1ecbnh v\u00e0 \u0111\u1ed3 th\u1ecb h\u00e0m s\u1ed1<\/a><\/strong><\/p>\n<h2>C\u00e1c l\u1ed7i th\u01b0\u1eddng g\u1eb7p khi l\u00e0m b\u00e0i v\u1ec1 h\u00ecnh thang<\/h2>\n<p>Khi gi\u1ea3i to\u00e1n v\u1ec1 h\u00ecnh thang, b\u1ea1n n\u00ean tr\u00e1nh nh\u1eefng nh\u1ea7m l\u1eabn ph\u1ed5 bi\u1ebfn sau \u0111\u00e2y.<\/p>\n<ul>\n<li>Nh\u1ea7m chi\u1ec1u cao v\u1edbi c\u1ea1nh b\u00ean: chi\u1ec1u cao l\u00e0 kho\u1ea3ng c\u00e1ch vu\u00f4ng g\u00f3c gi\u1eefa hai \u0111\u00e1y, kh\u00f4ng ph\u1ea3i \u0111\u1ed9 d\u00e0i c\u1ea1nh b\u00ean (tr\u1eeb h\u00ecnh thang vu\u00f4ng).<\/li>\n<li>Qu\u00ean chia \u0111\u00f4i trong c\u00f4ng th\u1ee9c di\u1ec7n t\u00edch: nhi\u1ec1u b\u1ea1n t\u00ednh (a + b) \u00d7 h m\u00e0 b\u1ecf m\u1ea5t h\u1ec7 s\u1ed1 \u00bd.<\/li>\n<li>C\u1ed9ng nh\u1ea7m \u0111\u00e1y v\u1edbi c\u1ea1nh b\u00ean khi t\u00ednh \u0111\u01b0\u1eddng trung b\u00ecnh: \u0111\u01b0\u1eddng trung b\u00ecnh ch\u1ec9 l\u1ea5y trung b\u00ecnh c\u1ed9ng c\u1ee7a hai \u0111\u00e1y.<\/li>\n<li>Nh\u1ea7m d\u1ea5u hi\u1ec7u nh\u1eadn bi\u1ebft: hai c\u1ea1nh b\u00ean b\u1eb1ng nhau ch\u01b0a ch\u1eafc l\u00e0 h\u00ecnh thang c\u00e2n n\u1ebfu ch\u00fang song song (khi \u0111\u00f3 th\u00e0nh h\u00ecnh b\u00ecnh h\u00e0nh).<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-569970 aligncenter\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/hinh-thang-4.jpg\" alt=\"hinh-thang-4\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/hinh-thang-4.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/hinh-thang-4-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/hinh-thang-4-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p v\u1ec1 h\u00ecnh thang<\/h2>\n<h3>H\u00ecnh thang l\u00e0 g\u00ec?<\/h3>\n<p>H\u00ecnh thang l\u00e0 t\u1ee9 gi\u00e1c c\u00f3 m\u1ed9t c\u1eb7p c\u1ea1nh \u0111\u1ed1i song song, g\u1ecdi l\u00e0 hai \u0111\u00e1y; hai c\u1ea1nh c\u00f2n l\u1ea1i l\u00e0 c\u1ea1nh b\u00ean.<\/p>\n<h3>C\u00f3 m\u1ea5y lo\u1ea1i h\u00ecnh thang?<\/h3>\n<p>C\u00f3 ba lo\u1ea1i: h\u00ecnh thang th\u01b0\u1eddng, h\u00ecnh thang vu\u00f4ng v\u00e0 h\u00ecnh thang c\u00e2n.<\/p>\n<h3>C\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch h\u00ecnh thang l\u00e0 g\u00ec?<\/h3>\n<p>Di\u1ec7n t\u00edch \u0111\u01b0\u1ee3c t\u00ednh b\u1eb1ng S = \u00bd \u00d7 (a + b) \u00d7 h, v\u1edbi a, b l\u00e0 \u0111\u1ed9 d\u00e0i hai \u0111\u00e1y v\u00e0 h l\u00e0 chi\u1ec1u cao.<\/p>\n<h3>C\u00f4ng th\u1ee9c t\u00ednh chu vi h\u00ecnh thang l\u00e0 g\u00ec?<\/h3>\n<p>Chu vi b\u1eb1ng t\u1ed5ng \u0111\u1ed9 d\u00e0i b\u1ed1n c\u1ea1nh: P = a + b + c + d.<\/p>\n<h3>\u0110\u01b0\u1eddng trung b\u00ecnh c\u1ee7a h\u00ecnh thang t\u00ednh th\u1ebf n\u00e0o?<\/h3>\n<p>\u0110\u01b0\u1eddng trung b\u00ecnh b\u1eb1ng n\u1eeda t\u1ed5ng hai \u0111\u00e1y: m = (a + b) \/ 2, v\u00e0 lu\u00f4n song song v\u1edbi hai \u0111\u00e1y.<\/p>\n<h3>H\u00ecnh thang c\u00e2n c\u00f3 \u0111\u1eb7c \u0111i\u1ec3m g\u00ec?<\/h3>\n<p>H\u00ecnh thang c\u00e2n c\u00f3 hai c\u1ea1nh b\u00ean b\u1eb1ng nhau, hai \u0111\u01b0\u1eddng ch\u00e9o b\u1eb1ng nhau v\u00e0 hai g\u00f3c k\u1ec1 m\u1ed9t \u0111\u00e1y b\u1eb1ng nhau.<\/p>\n<h2>K\u1ebft lu\u1eadn<\/h2>\n<p>T\u00f3m l\u1ea1i, h\u00ecnh thang l\u00e0 t\u1ee9 gi\u00e1c c\u00f3 m\u1ed9t c\u1eb7p c\u1ea1nh \u0111\u1ed1i song song, g\u1ed3m ba lo\u1ea1i: h\u00ecnh thang th\u01b0\u1eddng, h\u00ecnh thang vu\u00f4ng v\u00e0 h\u00ecnh thang c\u00e2n. B\u1ea1n ch\u1ec9 c\u1ea7n thu\u1ed9c c\u00f4ng th\u1ee9c di\u1ec7n t\u00edch S = \u00bd(a + b)h, chu vi P = a + b + c + d v\u00e0 \u0111\u01b0\u1eddng trung b\u00ecnh m = (a + b)\/2 l\u00e0 c\u00f3 th\u1ec3 gi\u1ea3i nhanh ph\u1ea7n l\u1edbn b\u00e0i t\u1eadp. N\u1eafm ch\u1eafc c\u00e1c t\u00ednh ch\u1ea5t v\u00e0 tr\u00e1nh nh\u1eefng l\u1ed7i th\u01b0\u1eddng g\u1eb7p s\u1ebd gi\u00fap b\u1ea1n t\u1ef1 tin h\u01a1n khi l\u00e0m to\u00e1n h\u00ecnh h\u1ecdc. B\u1ea1n c\u00f3 th\u1ec3 tham kh\u1ea3o th\u00eam c\u00e1c b\u00e0i <strong><a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/dien-tich-hinh-thoi\/\">di\u1ec7n t\u00edch h\u00ecnh thoi<\/a>, <a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/dien-tich-tam-giac\/\">c\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch tam gi\u00e1c<\/a><\/strong> v\u00e0 <strong><a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/dien-tich-hinh-tron\/\">c\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch h\u00ecnh tr\u00f2n<\/a><\/strong> tr\u00ean chuy\u00ean m\u1ee5c tin t\u1ee9c c\u1ee7a <strong>Ho\u00e0ng H\u00e0 Mobile<\/strong>.<\/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\": \"H\u00ecnh thang l\u00e0 g\u00ec?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"H\u00ecnh thang l\u00e0 t\u1ee9 gi\u00e1c c\u00f3 m\u1ed9t c\u1eb7p c\u1ea1nh \u0111\u1ed1i song song, g\u1ecdi l\u00e0 hai \u0111\u00e1y; hai c\u1ea1nh c\u00f2n l\u1ea1i l\u00e0 c\u1ea1nh b\u00ean.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"C\u00f3 m\u1ea5y lo\u1ea1i h\u00ecnh thang?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"C\u00f3 ba lo\u1ea1i: h\u00ecnh thang th\u01b0\u1eddng, h\u00ecnh thang vu\u00f4ng v\u00e0 h\u00ecnh thang c\u00e2n.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"C\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch h\u00ecnh thang l\u00e0 g\u00ec?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Di\u1ec7n t\u00edch \u0111\u01b0\u1ee3c t\u00ednh b\u1eb1ng S = \u00bd \u00d7 (a + b) \u00d7 h, v\u1edbi a, b l\u00e0 \u0111\u1ed9 d\u00e0i hai \u0111\u00e1y v\u00e0 h l\u00e0 chi\u1ec1u cao.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"C\u00f4ng th\u1ee9c t\u00ednh chu vi h\u00ecnh thang l\u00e0 g\u00ec?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Chu vi b\u1eb1ng t\u1ed5ng \u0111\u1ed9 d\u00e0i b\u1ed1n c\u1ea1nh: P = a + b + c + d.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"\u0110\u01b0\u1eddng trung b\u00ecnh c\u1ee7a h\u00ecnh thang t\u00ednh th\u1ebf n\u00e0o?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"\u0110\u01b0\u1eddng trung b\u00ecnh b\u1eb1ng n\u1eeda t\u1ed5ng hai \u0111\u00e1y: m = (a + b) \/ 2, v\u00e0 lu\u00f4n song song v\u1edbi hai \u0111\u00e1y.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"H\u00ecnh thang c\u00e2n c\u00f3 \u0111\u1eb7c \u0111i\u1ec3m g\u00ec?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"H\u00ecnh thang c\u00e2n c\u00f3 hai c\u1ea1nh b\u00ean b\u1eb1ng nhau, hai \u0111\u01b0\u1eddng ch\u00e9o b\u1eb1ng nhau v\u00e0 hai g\u00f3c k\u1ec1 m\u1ed9t \u0111\u00e1y b\u1eb1ng nhau.\"\n      }\n    }\n  ]\n}\n<\/script><\/p>\n","protected":false},"excerpt":{"rendered":"<p>H\u00ecnh thang l\u00e0 m\u1ed9t trong nh\u1eefng t\u1ee9 gi\u00e1c quen thu\u1ed9c nh\u1ea5t m\u00e0 b\u1ea1n g\u1eb7p t\u1eeb To\u00e1n l\u1edbp 5 \u0111\u1ebfn l\u1edbp 8. Ch\u1ec9 c\u1ea7n m\u1ed9t c\u1eb7p c\u1ea1nh \u0111\u1ed1i song song l\u00e0 b\u1ea1n \u0111\u00e3 c\u00f3 m\u1ed9t h\u00ecnh thang, th\u1ebf nh\u01b0ng xoay quanh h\u00ecnh n\u00e0y l\u1ea1i c\u00f3 kh\u00e1 nhi\u1ec1u \u0111i\u1ec1u \u0111\u00e1ng nh\u1edb: ba lo\u1ea1i h\u00ecnh thang kh\u00e1c nhau, [&hellip;]<\/p>\n","protected":false},"author":65,"featured_media":569966,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"h\u00ecnh thang l\u00e0 g\u00ec","_yoast_wpseo_title":"H\u00ecnh thang l\u00e0 g\u00ec? T\u00ednh ch\u1ea5t v\u00e0 c\u00f4ng th\u1ee9c t\u00ednh","_yoast_wpseo_metadesc":"H\u00ecnh thang l\u00e0 g\u00ec? T\u00ecm hi\u1ec3u \u0111\u1ecbnh ngh\u0129a, 3 lo\u1ea1i h\u00ecnh thang, t\u00ednh ch\u1ea5t, c\u00f4ng th\u1ee9c t\u00ednh chu vi, di\u1ec7n t\u00edch, \u0111\u01b0\u1eddng trung b\u00ecnh k\u00e8m b\u00e0i t\u1eadp c\u00f3 l\u1eddi gi\u1ea3i.","footnotes":""},"categories":[29235,3910,30453],"tags":[],"class_list":["post-569538","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>H\u00ecnh thang l\u00e0 g\u00ec? T\u00ednh ch\u1ea5t v\u00e0 c\u00f4ng th\u1ee9c t\u00ednh<\/title>\n<meta name=\"description\" content=\"H\u00ecnh thang l\u00e0 g\u00ec? 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