![\"dien-tich-hinh-vuong-1\"](\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/dien-tich-hinh-vuong-1.jpg.webp)
<\/picture>1.2. T\u00ednh ch\u1ea5t c\u1ee7a h\u00ecnh vu\u00f4ng<\/h3>\n\n- Hai \u0111\u01b0\u1eddng ch\u00e9o c\u00f3 chi\u1ec1u d\u00e0i b\u1eb1ng nhau, vu\u00f4ng g\u00f3c v\u1edbi nhau v\u00e0 c\u1eaft nhau t\u1ea1i trung \u0111i\u1ec3m c\u1ee7a m\u1ed7i \u0111\u01b0\u1eddng.<\/li>\n
- M\u1ed7i \u0111\u01b0\u1eddng ch\u00e9o chia h\u00ecnh vu\u00f4ng th\u00e0nh hai tam gi\u00e1c vu\u00f4ng c\u00e2n b\u1eb1ng nhau.<\/li>\n
- C\u00f3 m\u1ed9t \u0111\u01b0\u1eddng tr\u00f2n n\u1ed9i ti\u1ebfp v\u00e0 m\u1ed9t \u0111\u01b0\u1eddng tr\u00f2n ngo\u1ea1i ti\u1ebfp \u0111\u1ed3ng t\u00e2m.<\/li>\n
- S\u1edf h\u1eefu \u0111\u1ea7y \u0111\u1ee7 t\u00ednh ch\u1ea5t c\u1ee7a h\u00ecnh b\u00ecnh h\u00e0nh, h\u00ecnh ch\u1eef nh\u1eadt v\u00e0 h\u00ecnh thoi.<\/li>\n<\/ul>\n
1.3. D\u1ea5u hi\u1ec7u nh\u1eadn bi\u1ebft h\u00ecnh vu\u00f4ng<\/h3>\n
B\u1ea1n c\u00f3 th\u1ec3 x\u00e1c \u0111\u1ecbnh m\u1ed9t t\u1ee9 gi\u00e1c l\u00e0 h\u00ecnh vu\u00f4ng n\u1ebfu n\u00f3 th\u1ecfa m\u00e3n m\u1ed9t trong c\u00e1c \u0111i\u1ec1u ki\u1ec7n sau:<\/p>\n
\n- H\u00ecnh ch\u1eef nh\u1eadt c\u00f3 hai c\u1ea1nh k\u1ec1 b\u1eb1ng nhau.<\/li>\n
- H\u00ecnh ch\u1eef nh\u1eadt c\u00f3 hai \u0111\u01b0\u1eddng ch\u00e9o vu\u00f4ng g\u00f3c v\u1edbi nhau.<\/li>\n
- H\u00ecnh thoi c\u00f3 m\u1ed9t g\u00f3c vu\u00f4ng.<\/li>\n
- H\u00ecnh thoi c\u00f3 hai \u0111\u01b0\u1eddng ch\u00e9o b\u1eb1ng nhau.<\/li>\n<\/ul>\n
![\"dien-tich-hinh-vuong-2\"](\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-vuong-2.jpg\")
<\/picture><\/p>\nT\u00ecm hi\u1ec3u t\u00ednh ch\u1ea5t c\u1ee7a h\u00ecnh vu\u00f4ng<\/span><\/h2>\n\u0110\u1ec3 nh\u1eadn bi\u1ebft \u0111\u00f3 c\u00f3 ph\u1ea3i l\u00e0 h\u00ecnh vu\u00f4ng hay kh\u00f4ng v\u00e0 \u00e1p d\u1ee5ng c\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng, b\u1ea1n c\u1ea7n d\u1ef1a tr\u00ean t\u00ednh ch\u1ea5t v\u00e0 d\u1ea5u hi\u1ec7u nh\u1eadn bi\u1ebft sau:\u00a0<\/span><\/p>\nT\u00ednh ch\u1ea5t<\/span><\/h3>\nT\u00ednh ch\u1ea5t c\u1ee7a h\u00ecnh vu\u00f4ng l\u00e0:<\/span><\/p>\n\n- 2 \u0111\u01b0\u1eddng ch\u00e9o c\u1ee7a h\u00ecnh vu\u00f4ng c\u00f3 chi\u1ec1u d\u00e0i b\u1eb1ng nhau v\u00e0 c\u1eaft nhau t\u1ea1i trung \u0111i\u1ec3m c\u1ee7a 2 \u0111\u01b0\u1eddng. \u0110\u1ed3ng th\u1eddi, hai \u0111\u01b0\u1eddng ch\u00e9o \u0111\u00f3 khi g\u1eb7p nhau s\u1ebd vu\u00f4ng g\u00f3c v\u1edbi nhau.\u00a0<\/span><\/li>\n
- \u0110\u01b0\u1eddng tr\u00f2n n\u1ed9i ti\u1ebfp c\u00f3 t\u00e2m tr\u00f9ng v\u1edbi t\u00e2m c\u1ee7a \u0111\u01b0\u1eddng tr\u00f2n ngo\u1ea1i ti\u1ebfp v\u00e0 tr\u00f9ng t\u1ea1i giao \u0111i\u1ec3m c\u1ee7a hai \u0111\u01b0\u1eddng ch\u00e9o trong h\u00ecnh vu\u00f4ng.\u00a0<\/span><\/li>\n
- M\u1ed7i \u0111\u01b0\u1eddng ch\u00e9o \u0111\u1ec1u chia h\u00ecnh vu\u00f4ng th\u00e0nh 2 h\u00ecnh tam gi\u00e1c b\u1eb1ng nhau.<\/span><\/li>\n
- H\u00ecnh vu\u00f4ng c\u0169ng s\u1edf h\u1eefu c\u00e1c t\u00ednh ch\u1ea5t c\u1ee7a h\u00ecnh t\u1ee9 gi\u00e1c kh\u00e1c nh\u01b0 h\u00ecnh b\u00ecnh h\u00e0nh, h\u00ecnh thoi v\u00e0 h\u00ecnh ch\u1eef nh\u1eadt.<\/span><\/li>\n<\/ul>\n<\/div>\n
![\"dien-tich-hinh-vuong-3\"](\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-vuong-3.jpg\")
<\/picture><\/p>\nD\u1ea5u hi\u1ec7u nh\u1eadn bi\u1ebft h\u00ecnh vu\u00f4ng<\/span><\/h3>\nTh\u00f4ng qua c\u00e1c d\u1ea5u hi\u1ec7u sau, b\u1ea1n c\u00f3 th\u1ec3 nh\u1eadn bi\u1ebft \u0111\u01b0\u1ee3c h\u00ecnh t\u1ee9 gi\u00e1c \u0111\u00f3 c\u00f3 ph\u1ea3i h\u00ecnh vu\u00f4ng hay kh\u00f4ng:<\/span><\/p>\n\n- N\u1ebfu l\u00e0 m\u1ed9t h\u00ecnh ch\u1eef nh\u1eadt c\u00f3 chi\u1ec1u d\u00e0i 2 c\u1ea1nh k\u1ec1 b\u1eb1ng nhau, th\u00ec c\u00f3 th\u1ec3 x\u00e1c \u0111\u1ecbnh \u0111\u00f3 l\u00e0 h\u00ecnh vu\u00f4ng.\u00a0<\/span><\/li>\n
- N\u1ebfu l\u00e0 h\u00ecnh ch\u1eef nh\u1eadt c\u00f3 2 \u0111\u01b0\u1eddng ch\u00e9o vu\u00f4ng g\u00f3c v\u1edbi nhau, th\u00ec c\u00f3 th\u1ec3 x\u00e1c \u0111\u1ecbnh \u0111\u00f3 l\u00e0 h\u00ecnh vu\u00f4ng.<\/span><\/li>\n
- N\u1ebfu l\u00e0 h\u00ecnh thoi c\u00f3 m\u1ed9t g\u00f3c vu\u00f4ng ho\u1eb7c 2 \u0111\u01b0\u1eddng ch\u00e9o c\u1ee7a h\u00ecnh thoi c\u00f3 chi\u1ec1u d\u00e0i b\u1eb1ng nhau, ch\u00fang ta c\u00f3 th\u1ec3 x\u00e1c \u0111\u1ecbnh \u0111\u00f3 l\u00e0 h\u00ecnh vu\u00f4ng.<\/span><\/li>\n<\/ul>\n<\/div>\n
C\u00e1c c\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng<\/h2>\n2.1. C\u00f4ng th\u1ee9c c\u01a1 b\u1ea3n (khi bi\u1ebft \u0111\u1ed9 d\u00e0i c\u1ea1nh)<\/h4>\n
\u0110\u00e2y l\u00e0 c\u00f4ng th\u1ee9c ph\u1ed5 bi\u1ebfn v\u00e0 d\u1ec5 nh\u1edb nh\u1ea5t. Di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng b\u1eb1ng b\u00ecnh ph\u01b0\u01a1ng \u0111\u1ed9 d\u00e0i c\u1ee7a m\u1ed9t c\u1ea1nh.<\/p>\n
G\u1ecdi\u00a0S<\/strong>\u00a0l\u00e0 di\u1ec7n t\u00edch v\u00e0\u00a0a<\/strong>\u00a0l\u00e0 \u0111\u1ed9 d\u00e0i c\u1ea1nh, ta c\u00f3:<\/p>\nS = a x a = a\u00b2<\/strong><\/p>\nV\u00ed d\u1ee5: M\u1ed9t h\u00ecnh vu\u00f4ng c\u00f3 c\u1ea1nh d\u00e0i 5 cm th\u00ec di\u1ec7n t\u00edch l\u00e0: S = 5 x 5 = 25 cm\u00b2.<\/em><\/p>\n![\"dien-tich-hinh-vuong-4\"](\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-vuong-4.jpg\")
<\/picture><\/p>\n2.2. C\u00e1ch t\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng khi bi\u1ebft chu vi<\/h4>\n
N\u1ebfu \u0111\u1ec1 b\u00e0i cho chu vi (P) c\u1ee7a h\u00ecnh vu\u00f4ng, b\u1ea1n c\u1ea7n t\u00ecm \u0111\u1ed9 d\u00e0i c\u1ea1nh tr\u01b0\u1edbc, sau \u0111\u00f3 \u00e1p d\u1ee5ng c\u00f4ng th\u1ee9c c\u01a1 b\u1ea3n.<\/p>\n
\n- B\u01b0\u1edbc 1: T\u00ednh \u0111\u1ed9 d\u00e0i c\u1ea1nh (a).<\/strong>\u00a0V\u00ec chu vi P = a x 4, suy ra:\u00a0a = P \/ 4.<\/li>\n
- B\u01b0\u1edbc 2: T\u00ednh di\u1ec7n t\u00edch.<\/strong>\u00a0\u00c1p d\u1ee5ng c\u00f4ng th\u1ee9c:\u00a0S = a x a.<\/li>\n<\/ol>\n
V\u00ed d\u1ee5: M\u1ed9t h\u00ecnh vu\u00f4ng c\u00f3 chu vi 20 cm. C\u1ea1nh c\u1ee7a n\u00f3 l\u00e0 20 \/ 4 = 5 cm. Di\u1ec7n t\u00edch l\u00e0 S = 5 x 5 = 25 cm\u00b2.![\"dien-tich-hinh-vuong-5\"](\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-vuong-5.jpg\")
<\/picture><\/em><\/p>\n2.3. C\u00e1ch t\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng khi bi\u1ebft \u0111\u01b0\u1eddng ch\u00e9o<\/h4>\n
V\u00ec h\u00ecnh vu\u00f4ng l\u00e0 h\u00ecnh thoi \u0111\u1eb7c bi\u1ec7t, ta c\u00f3 th\u1ec3 d\u00f9ng c\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch h\u00ecnh thoi qua hai \u0111\u01b0\u1eddng ch\u00e9o (d1, d2). Trong h\u00ecnh vu\u00f4ng, hai \u0111\u01b0\u1eddng ch\u00e9o b\u1eb1ng nhau (g\u1ecdi l\u00e0 d).<\/p>\n
C\u00f4ng th\u1ee9c l\u00e0:\u00a0S = \u00bd x (d x d) = d\u00b2 \/ 2<\/strong><\/p>\nV\u00ed d\u1ee5: M\u1ed9t h\u00ecnh vu\u00f4ng c\u00f3 \u0111\u01b0\u1eddng ch\u00e9o d\u00e0i 10 cm. Di\u1ec7n t\u00edch c\u1ee7a n\u00f3 l\u00e0 S = (10 x 10) \/ 2 = 50 cm\u00b2.<\/em><\/p>\n![\"dien-tich-hinh-vuong-6\"](\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-vuong-6.jpg\")
<\/picture><\/p>\n2.4. C\u00e1c ph\u01b0\u01a1ng ph\u00e1p suy lu\u1eadn kh\u00e1c<\/h4>\n\n- T\u1eeb 2 tam gi\u00e1c vu\u00f4ng c\u00e2n:<\/strong>\u00a0M\u1ed9t \u0111\u01b0\u1eddng ch\u00e9o chia h\u00ecnh vu\u00f4ng th\u00e0nh 2 tam gi\u00e1c vu\u00f4ng c\u00e2n b\u1eb1ng nhau. Di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng b\u1eb1ng t\u1ed5ng di\u1ec7n t\u00edch 2 tam gi\u00e1c n\u00e0y.<\/li>\n
- T\u1eeb 2 h\u00ecnh ch\u1eef nh\u1eadt:<\/strong>\u00a0M\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng song song v\u1edbi m\u1ed9t c\u1ea1nh c\u00f3 th\u1ec3 chia h\u00ecnh vu\u00f4ng th\u00e0nh 2 h\u00ecnh ch\u1eef nh\u1eadt. Di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng b\u1eb1ng t\u1ed5ng di\u1ec7n t\u00edch 2 h\u00ecnh ch\u1eef nh\u1eadt \u0111\u00f3.
![\"dien-tich-hinh-vuong-7\"](\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-vuong-7.jpg\")
<\/picture><\/li>\n<\/ul>\n2.5. M\u1eb9o ghi nh\u1edb c\u00f4ng th\u1ee9c<\/h4>\n
\u0110\u1ec3 kh\u00f4ng b\u1ecb nh\u1ea7m l\u1eabn gi\u1eefa chu vi v\u00e0 di\u1ec7n t\u00edch, b\u1ea1n c\u00f3 th\u1ec3 ghi nh\u1edb m\u1eb9o sau:<\/p>\n
“Mu\u1ed1n t\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng,
\nC\u1ea1nh nh\u00e2n v\u1edbi ch\u00ednh n\u00f3, ta t\u00ecm ra.
\nChu vi th\u00ec t\u00ednh kh\u00e1c xa,
\nC\u1ea1nh nh\u00e2n v\u1edbi b\u1ed1n, th\u1ebf l\u00e0 xong ngay.”<\/em><\/p><\/blockquote>\n![\"dien-tich-hinh-vuong-8\"](\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-vuong-8.jpg\")
<\/picture><\/p>\nM\u1ed9t s\u1ed1 l\u01b0u \u00fd c\u1ea7n bi\u1ebft khi t\u00ednh v\u1ec1 di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng<\/span><\/h2>\nD\u01b0\u1edbi \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 l\u01b0u \u00fd b\u1ea1n c\u1ea7n quan t\u00e2m khi \u00e1p d\u1ee5ng c\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh vu\u00f4ng \u1edf tr\u00ean.\u00a0<\/span><\/p>\n\n- Khi t\u00ednh, c\u00e1c c\u1ea1nh ph\u1ea3i c\u00f9ng m\u1ed9t \u0111\u01a1n v\u1ecb \u0111o (ch\u1eb3ng h\u1ea1n nh\u01b0 m2, cm2\u2026). \u0110\u00e2y l\u00e0 nguy\u00ean t\u1eafc \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng cho b\u1ea5t k\u1ef3 c\u00f4ng th\u1ee9c t\u00ednh n\u00e0o trong to\u00e1n h\u1ecdc, t\u1ea5t c\u1ea3 c\u00e1c s\u1ed1 li\u1ec7u ph\u1ea3i c\u00f3 c\u00f9ng \u0111\u01a1n v\u1ecb \u0111o, n\u1ebfu nh\u01b0 \u0111\u1ec1 cho kh\u00e1c \u0111\u01a1n v\u1ecb, b\u1ea1n bu\u1ed9c ph\u1ea3i chuy\u1ec3n v\u1ec1 m\u1ed9t \u0111\u01a1n v\u1ecb chung nh\u01b0 cm2, m2\u2026 r\u1ed3i m\u1edbi th\u1ef1c hi\u1ec7n c\u00e1c b\u01b0\u1edbc t\u00ednh to\u00e1n kh\u00e1c nhau.\u00a0<\/span><\/li>\n
- Khi t\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng (hay b\u1ea5t k\u1ef3 di\u1ec7n t\u00edch h\u00ecnh h\u1ecdc n\u00e0o \u0111\u00f3), b\u1ea1n \u0111\u1ec1u s\u1eed d\u1ee5ng \u0111\u01a1n v\u1ecb \u0111o di\u1ec7n t\u00edch nh\u01b0 cm2 ho\u1eb7c m2, ch\u00fang ta kh\u00f4ng s\u1eed d\u1ee5ng di\u1ec7n t\u00edch th\u01b0\u1eddng nh\u01b0 m, cm\u2026\u00a0<\/span><\/li>\n
- C\u1ea7n n\u1eafm r\u00f5 v\u00e0 ph\u00e2n bi\u1ec7t c\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch v\u1edbi chu vi. Hai c\u00f4ng th\u1ee9c n\u00e0y th\u01b0\u1eddng b\u1ecb nh\u1ea7m l\u1eabn d\u1eabn \u0111\u1ebfn k\u1ebft qu\u1ea3 sai l\u00e0m \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn c\u1ea3 b\u00e0i to\u00e1n.\u00a0<\/span><\/li>\n
- B\u1ea1n c\u00f3 th\u1ec3 v\u1eadn d\u1ee5ng c\u00f4ng th\u1ee9c v\u00e0 t\u00ednh ch\u1ea5t c\u1ee7a c\u00e1c h\u00ecnh t\u1ee9 gi\u00e1c kh\u00e1c nh\u01b0 h\u00ecnh ch\u1eef nh\u1eadt, h\u00ecnh thang, h\u00ecnh thoi \u0111\u1ec3 t\u00ednh ra di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh vu\u00f4ng n\u1ebfu \u0111\u1ec1 kh\u00f4ng cho b\u1ea1n s\u1ed1 li\u1ec7u chi\u1ec1u d\u00e0i c\u1ea1nh.\u00a0<\/span><\/li>\n<\/ul>\n
![\"dien-tich-hinh-vuong-9\"](\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-vuong-9.jpg\")
<\/picture>C\u00e1c th\u00f4ng s\u1ed1 ph\u1ea3i c\u00f9ng \u0111\u01a1n v\u1ecb \u0111o<\/figcaption><\/figure>\nC\u00e1c d\u1ea1ng b\u00e0i t\u1eadp t\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng (c\u00f3 l\u1eddi gi\u1ea3i)<\/h2>\n
H\u00e3y c\u00f9ng th\u1ef1c h\u00e0nh qua c\u00e1c v\u00ed d\u1ee5 d\u01b0\u1edbi \u0111\u00e2y \u0111\u1ec3 n\u1eafm v\u1eefng ki\u1ebfn th\u1ee9c nh\u00e9!<\/p>\n
B\u00e0i t\u1eadp 1 (C\u01a1 b\u1ea3n):<\/strong>\u00a0M\u1ed9t t\u1edd gi\u1ea5y h\u00ecnh vu\u00f4ng c\u00f3 c\u1ea1nh d\u00e0i 100mm. T\u00ednh di\u1ec7n t\u00edch t\u1edd gi\u1ea5y theo \u0111\u01a1n v\u1ecb cm\u00b2.<\/p>\n\n- L\u1eddi gi\u1ea3i:<\/strong>
\n\u0110\u1ed5i \u0111\u01a1n v\u1ecb: 100mm = 10cm.
\nDi\u1ec7n t\u00edch t\u1edd gi\u1ea5y l\u00e0: S = 10 x 10 = 100 cm\u00b2.![\"dien-tich-hinh-vuong-11\"](\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-vuong-11.jpg\")
<\/picture><\/li>\n<\/ul>\nB\u00e0i t\u1eadp 2 (T\u00ednh t\u1eeb chu vi):<\/strong>\u00a0Cho m\u1ed9t m\u1ea3nh \u0111\u1ea5t h\u00ecnh vu\u00f4ng c\u00f3 chu vi l\u00e0 72m. T\u00ednh di\u1ec7n t\u00edch m\u1ea3nh \u0111\u1ea5t \u0111\u00f3.<\/p>\n\n- L\u1eddi gi\u1ea3i:<\/strong>
\n\u0110\u1ed9 d\u00e0i c\u1ea1nh c\u1ee7a m\u1ea3nh \u0111\u1ea5t l\u00e0: a = 72 : 4 = 18 m.
\nDi\u1ec7n t\u00edch m\u1ea3nh \u0111\u1ea5t l\u00e0: S = 18 x 18 = 324 m\u00b2.<\/li>\n<\/ul>\nB\u00e0i t\u1eadp 3 (Nh\u1eadn bi\u1ebft h\u00ecnh vu\u00f4ng):<\/strong>\u00a0M\u1ed9t h\u00ecnh thoi c\u00f3 m\u1ed9t g\u00f3c vu\u00f4ng v\u00e0 \u0111\u1ed9 d\u00e0i c\u1ea1nh l\u00e0 8cm. T\u00ednh di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh \u0111\u00f3.<\/p>\n\n- L\u1eddi gi\u1ea3i:<\/strong>
\nTheo d\u1ea5u hi\u1ec7u nh\u1eadn bi\u1ebft, h\u00ecnh thoi c\u00f3 1 g\u00f3c vu\u00f4ng l\u00e0 h\u00ecnh vu\u00f4ng.
\nV\u1eady, di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh \u0111\u00f3 l\u00e0: S = 8 x 8 = 64 cm\u00b2.<\/li>\n<\/ul>\n![\"dien-tich-hinh-vuong-10\"](\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-vuong-10.jpg\")
<\/picture>B\u00e0i t\u1eadp 4 (B\u00e0i to\u00e1n t\u1ed5ng h\u1ee3p):<\/strong>\u00a0Ng\u01b0\u1eddi ta gh\u00e9p 9 m\u1ea3nh gi\u1ea5y h\u00ecnh vu\u00f4ng (m\u1ed7i m\u1ea3nh c\u00f3 c\u1ea1nh 5cm) l\u1ea1i v\u1edbi nhau \u0111\u1ec3 t\u1ea1o th\u00e0nh m\u1ed9t h\u00ecnh vu\u00f4ng l\u1edbn h\u01a1n. T\u00ednh di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh vu\u00f4ng l\u1edbn \u0111\u00f3.<\/p>\n\n- L\u1eddi gi\u1ea3i:<\/strong>
\nDi\u1ec7n t\u00edch m\u1ed9t m\u1ea3nh gi\u1ea5y nh\u1ecf l\u00e0: 5 x 5 = 25 cm\u00b2.
\nDi\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng l\u1edbn \u0111\u01b0\u1ee3c t\u1ea1o th\u00e0nh t\u1eeb 9 m\u1ea3nh nh\u1ecf l\u00e0: 25 x 9 = 225 cm\u00b2.![\"dien-tich-hinh-vuong-12\"](\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-vuong-12.jpg\")
<\/picture><\/li>\n<\/ul>\nB\u00e0i t\u1eadp 5 (B\u00e0i to\u00e1n th\u1ef1c t\u1ebf):<\/strong>\u00a0M\u1ed9t m\u1ea3nh \u0111\u1ea5t h\u00ecnh vu\u00f4ng \u0111\u01b0\u1ee3c m\u1edf r\u1ed9ng th\u00eam v\u1ec1 m\u1ed9t ph\u00eda 6m, t\u1ea1o th\u00e0nh m\u1ed9t m\u1ea3nh \u0111\u1ea5t h\u00ecnh ch\u1eef nh\u1eadt m\u1edbi c\u00f3 chu vi 112m. T\u00ednh di\u1ec7n t\u00edch m\u1ea3nh \u0111\u1ea5t h\u00ecnh ch\u1eef nh\u1eadt sau khi m\u1edf r\u1ed9ng.<\/p>\n\n- L\u1eddi gi\u1ea3i:<\/strong>
\nG\u1ecdi c\u1ea1nh h\u00ecnh vu\u00f4ng ban \u0111\u1ea7u l\u00e0 ‘a’. M\u1ea3nh \u0111\u1ea5t m\u1edbi l\u00e0 h\u00ecnh ch\u1eef nh\u1eadt c\u00f3 c\u00e1c c\u1ea1nh l\u00e0 ‘a’ v\u00e0 ‘a+6’.
\nChu vi h\u00ecnh ch\u1eef nh\u1eadt: P = 2 x (a + (a+6)) = 112 => 2 x (2a + 6) = 112 => 2a + 6 = 56 => 2a = 50 => a = 25 m.
\nC\u1ea1nh h\u00ecnh vu\u00f4ng ban \u0111\u1ea7u l\u00e0 25 m.
\nC\u00e1c c\u1ea1nh c\u1ee7a m\u1ea3nh \u0111\u1ea5t m\u1edbi l\u00e0 25m v\u00e0 25+6 = 31m.
\nDi\u1ec7n t\u00edch m\u1ea3nh \u0111\u1ea5t sau khi m\u1edf r\u1ed9ng l\u00e0: 25 x 31 = 775 m\u00b2.<\/li>\n<\/ul>\nB\u00ean tr\u00ean l\u00e0 c\u00e1ch t\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng m\u00e0 b\u1ea1n c\u00f3 th\u1ec3 tham kh\u1ea3o. Hy v\u1ecdng b\u00e0i vi\u1ebft s\u1ebd h\u1eefu \u00edch v\u00e0 \u0111\u1eebng qu\u00ean chia s\u1ebb \u0111\u1ec3 m\u1ecdi ng\u01b0\u1eddi c\u00f9ng \u0111\u00f3n \u0111\u1ecdc, b\u1ea1n nh\u00e9!<\/span><\/p>\nXem th\u00eam:<\/span><\/p>\n\n- C\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt ch\u00ednh x\u00e1c nh\u1ea5t<\/a><\/strong><\/li>\n
- C\u00e1ch gi\u1ea3i ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc 2 nhanh ch\u00f3ng nh\u1ea5t<\/a><\/strong><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"
C\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng l\u00e0 m\u1ed9t ki\u1ebfn th\u1ee9c to\u00e1n h\u1ecdc c\u01a1 b\u1ea3n, \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng t\u1eeb gh\u1ebf nh\u00e0 tr\u01b0\u1eddng \u0111\u1ebfn c\u00e1c \u1ee9ng d\u1ee5ng th\u1ef1c t\u1ebf nh\u01b0 x\u00e2y d\u1ef1ng, thi\u1ebft k\u1ebf. N\u1eafm v\u1eefng c\u00e1ch t\u00ednh s\u1ebd gi\u00fap b\u1ea1n gi\u1ea3i quy\u1ebft c\u00e1c b\u00e0i to\u00e1n li\u00ean quan m\u1ed9t c\u00e1ch nhanh ch\u00f3ng v\u00e0 ch\u00ednh x\u00e1c. Trong […]<\/p>\n","protected":false},"author":97,"featured_media":298329,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3910,30453],"tags":[],"class_list":["post-298328","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-kham-pha","category-kien-thuc"],"yoast_head":"\n
C\u00e1ch T\u00ednh Di\u1ec7n T\u00edch H\u00ecnh Vu\u00f4ng - C\u00f4ng Th\u1ee9c, V\u00ed D\u1ee5 & 5+ B\u00e0i T\u1eadp C\u00f3 L\u1eddi Gi\u1ea3i<\/title>\n<meta name=\"description\" content=\"H\u01b0\u1edbng d\u1eabn chi ti\u1ebft c\u00e1ch t\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng v\u1edbi c\u00f4ng th\u1ee9c S = a x a. Bao g\u1ed3m c\u00e1c ph\u01b0\u01a1ng ph\u00e1p t\u00ednh t\u1eeb chu vi, \u0111\u01b0\u1eddng ch\u00e9o, v\u00ed d\u1ee5 minh h\u1ecda v\u00e0 b\u00e0i t\u1eadp v\u1eadn 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-vuong\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"C\u00e1ch t\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng: C\u00f4ng th\u1ee9c, v\u00ed d\u1ee5 v\u00e0 c\u00e1c d\u1ea1ng b\u00e0i t\u1eadp th\u01b0\u1eddng g\u1eb7p\" \/>\n<meta property=\"og:description\" content=\"H\u01b0\u1edbng d\u1eabn chi ti\u1ebft c\u00e1ch t\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng v\u1edbi c\u00f4ng th\u1ee9c S = a x a. Bao g\u1ed3m c\u00e1c ph\u01b0\u01a1ng ph\u00e1p t\u00ednh t\u1eeb chu vi, \u0111\u01b0\u1eddng ch\u00e9o, v\u00ed d\u1ee5 minh h\u1ecda v\u00e0 b\u00e0i t\u1eadp v\u1eadn d\u1ee5ng.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/hoanghamobile.com\/tin-tuc\/dien-tich-hinh-vuong\/\" \/>\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:published_time\" content=\"2023-12-20T12:59:43+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-10-09T03:05:44+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-vuong.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 Th\u1ecb M\u1ef9 Li\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 Th\u1ecb M\u1ef9 Li\u00ean\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u01af\u1edbc t\u00ednh th\u1eddi gian \u0111\u1ecdc\" \/>\n\t<meta name=\"twitter:data2\" content=\"12 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\/dien-tich-hinh-vuong\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/hoanghamobile.com\/tin-tuc\/dien-tich-hinh-vuong\/\"},\"author\":{\"name\":\"Nguy\u1ec5n Th\u1ecb M\u1ef9 Li\u00ean\",\"@id\":\"https:\/\/hoanghamobile.com\/tin-tuc\/#\/schema\/person\/8bdc637e22d0dfe8143434576119c189\"},\"headline\":\"C\u00e1ch t\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng: C\u00f4ng th\u1ee9c, v\u00ed d\u1ee5 v\u00e0 c\u00e1c d\u1ea1ng b\u00e0i t\u1eadp th\u01b0\u1eddng g\u1eb7p\",\"datePublished\":\"2023-12-20T12:59:43+00:00\",\"dateModified\":\"2025-10-09T03:05:44+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/hoanghamobile.com\/tin-tuc\/dien-tich-hinh-vuong\/\"},\"wordCount\":2426,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/hoanghamobile.com\/tin-tuc\/#organization\"},\"image\":{\"@id\":\"https:\/\/hoanghamobile.com\/tin-tuc\/dien-tich-hinh-vuong\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-vuong.jpg\",\"articleSection\":[\"Kh\u00e1m Ph\u00e1\",\"Ki\u1ebfn Th\u1ee9c\"],\"inLanguage\":\"vi\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/hoanghamobile.com\/tin-tuc\/dien-tich-hinh-vuong\/#respond\"]}],\"copyrightYear\":\"2023\",\"copyrightHolder\":{\"@id\":\"https:\/\/hoanghamobile.com\/tin-tuc\/#organization\"}},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/hoanghamobile.com\/tin-tuc\/dien-tich-hinh-vuong\/\",\"url\":\"https:\/\/hoanghamobile.com\/tin-tuc\/dien-tich-hinh-vuong\/\",\"name\":\"C\u00e1ch T\u00ednh Di\u1ec7n T\u00edch H\u00ecnh Vu\u00f4ng - C\u00f4ng Th\u1ee9c, V\u00ed D\u1ee5 & 5+ B\u00e0i T\u1eadp C\u00f3 L\u1eddi Gi\u1ea3i\",\"isPartOf\":{\"@id\":\"https:\/\/hoanghamobile.com\/tin-tuc\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/hoanghamobile.com\/tin-tuc\/dien-tich-hinh-vuong\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/hoanghamobile.com\/tin-tuc\/dien-tich-hinh-vuong\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2023\/12\/dien-tich-hinh-vuong.jpg\",\"datePublished\":\"2023-12-20T12:59:43+00:00\",\"dateModified\":\"2025-10-09T03:05:44+00:00\",\"description\":\"H\u01b0\u1edbng d\u1eabn chi ti\u1ebft c\u00e1ch t\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng v\u1edbi c\u00f4ng th\u1ee9c S = a x a. 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1.3. D\u1ea5u hi\u1ec7u nh\u1eadn bi\u1ebft h\u00ecnh vu\u00f4ng<\/h3>\n
B\u1ea1n c\u00f3 th\u1ec3 x\u00e1c \u0111\u1ecbnh m\u1ed9t t\u1ee9 gi\u00e1c l\u00e0 h\u00ecnh vu\u00f4ng n\u1ebfu n\u00f3 th\u1ecfa m\u00e3n m\u1ed9t trong c\u00e1c \u0111i\u1ec1u ki\u1ec7n sau:<\/p>\n
- \n
- H\u00ecnh ch\u1eef nh\u1eadt c\u00f3 hai c\u1ea1nh k\u1ec1 b\u1eb1ng nhau.<\/li>\n
- H\u00ecnh ch\u1eef nh\u1eadt c\u00f3 hai \u0111\u01b0\u1eddng ch\u00e9o vu\u00f4ng g\u00f3c v\u1edbi nhau.<\/li>\n
- H\u00ecnh thoi c\u00f3 m\u1ed9t g\u00f3c vu\u00f4ng.<\/li>\n
- H\u00ecnh thoi c\u00f3 hai \u0111\u01b0\u1eddng ch\u00e9o b\u1eb1ng nhau.<\/li>\n<\/ul>\n<\/picture><\/p>\n
T\u00ecm hi\u1ec3u t\u00ednh ch\u1ea5t c\u1ee7a h\u00ecnh vu\u00f4ng<\/span><\/h2>\n
\u0110\u1ec3 nh\u1eadn bi\u1ebft \u0111\u00f3 c\u00f3 ph\u1ea3i l\u00e0 h\u00ecnh vu\u00f4ng hay kh\u00f4ng v\u00e0 \u00e1p d\u1ee5ng c\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng, b\u1ea1n c\u1ea7n d\u1ef1a tr\u00ean t\u00ednh ch\u1ea5t v\u00e0 d\u1ea5u hi\u1ec7u nh\u1eadn bi\u1ebft sau:\u00a0<\/span><\/p>\n
T\u00ednh ch\u1ea5t<\/span><\/h3>\n
T\u00ednh ch\u1ea5t c\u1ee7a h\u00ecnh vu\u00f4ng l\u00e0:<\/span><\/p>\n
- \n
- 2 \u0111\u01b0\u1eddng ch\u00e9o c\u1ee7a h\u00ecnh vu\u00f4ng c\u00f3 chi\u1ec1u d\u00e0i b\u1eb1ng nhau v\u00e0 c\u1eaft nhau t\u1ea1i trung \u0111i\u1ec3m c\u1ee7a 2 \u0111\u01b0\u1eddng. \u0110\u1ed3ng th\u1eddi, hai \u0111\u01b0\u1eddng ch\u00e9o \u0111\u00f3 khi g\u1eb7p nhau s\u1ebd vu\u00f4ng g\u00f3c v\u1edbi nhau.\u00a0<\/span><\/li>\n
- \u0110\u01b0\u1eddng tr\u00f2n n\u1ed9i ti\u1ebfp c\u00f3 t\u00e2m tr\u00f9ng v\u1edbi t\u00e2m c\u1ee7a \u0111\u01b0\u1eddng tr\u00f2n ngo\u1ea1i ti\u1ebfp v\u00e0 tr\u00f9ng t\u1ea1i giao \u0111i\u1ec3m c\u1ee7a hai \u0111\u01b0\u1eddng ch\u00e9o trong h\u00ecnh vu\u00f4ng.\u00a0<\/span><\/li>\n
- M\u1ed7i \u0111\u01b0\u1eddng ch\u00e9o \u0111\u1ec1u chia h\u00ecnh vu\u00f4ng th\u00e0nh 2 h\u00ecnh tam gi\u00e1c b\u1eb1ng nhau.<\/span><\/li>\n
- H\u00ecnh vu\u00f4ng c\u0169ng s\u1edf h\u1eefu c\u00e1c t\u00ednh ch\u1ea5t c\u1ee7a h\u00ecnh t\u1ee9 gi\u00e1c kh\u00e1c nh\u01b0 h\u00ecnh b\u00ecnh h\u00e0nh, h\u00ecnh thoi v\u00e0 h\u00ecnh ch\u1eef nh\u1eadt.<\/span><\/li>\n<\/ul>\n
<\/div>\n<\/picture><\/p>\nD\u1ea5u hi\u1ec7u nh\u1eadn bi\u1ebft h\u00ecnh vu\u00f4ng<\/span><\/h3>\n
Th\u00f4ng qua c\u00e1c d\u1ea5u hi\u1ec7u sau, b\u1ea1n c\u00f3 th\u1ec3 nh\u1eadn bi\u1ebft \u0111\u01b0\u1ee3c h\u00ecnh t\u1ee9 gi\u00e1c \u0111\u00f3 c\u00f3 ph\u1ea3i h\u00ecnh vu\u00f4ng hay kh\u00f4ng:<\/span><\/p>\n
- \n
- N\u1ebfu l\u00e0 m\u1ed9t h\u00ecnh ch\u1eef nh\u1eadt c\u00f3 chi\u1ec1u d\u00e0i 2 c\u1ea1nh k\u1ec1 b\u1eb1ng nhau, th\u00ec c\u00f3 th\u1ec3 x\u00e1c \u0111\u1ecbnh \u0111\u00f3 l\u00e0 h\u00ecnh vu\u00f4ng.\u00a0<\/span><\/li>\n
- N\u1ebfu l\u00e0 h\u00ecnh ch\u1eef nh\u1eadt c\u00f3 2 \u0111\u01b0\u1eddng ch\u00e9o vu\u00f4ng g\u00f3c v\u1edbi nhau, th\u00ec c\u00f3 th\u1ec3 x\u00e1c \u0111\u1ecbnh \u0111\u00f3 l\u00e0 h\u00ecnh vu\u00f4ng.<\/span><\/li>\n
- N\u1ebfu l\u00e0 h\u00ecnh thoi c\u00f3 m\u1ed9t g\u00f3c vu\u00f4ng ho\u1eb7c 2 \u0111\u01b0\u1eddng ch\u00e9o c\u1ee7a h\u00ecnh thoi c\u00f3 chi\u1ec1u d\u00e0i b\u1eb1ng nhau, ch\u00fang ta c\u00f3 th\u1ec3 x\u00e1c \u0111\u1ecbnh \u0111\u00f3 l\u00e0 h\u00ecnh vu\u00f4ng.<\/span><\/li>\n<\/ul>\n
<\/div>\nC\u00e1c c\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng<\/h2>\n
2.1. C\u00f4ng th\u1ee9c c\u01a1 b\u1ea3n (khi bi\u1ebft \u0111\u1ed9 d\u00e0i c\u1ea1nh)<\/h4>\n
\u0110\u00e2y l\u00e0 c\u00f4ng th\u1ee9c ph\u1ed5 bi\u1ebfn v\u00e0 d\u1ec5 nh\u1edb nh\u1ea5t. Di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng b\u1eb1ng b\u00ecnh ph\u01b0\u01a1ng \u0111\u1ed9 d\u00e0i c\u1ee7a m\u1ed9t c\u1ea1nh.<\/p>\n
G\u1ecdi\u00a0S<\/strong>\u00a0l\u00e0 di\u1ec7n t\u00edch v\u00e0\u00a0a<\/strong>\u00a0l\u00e0 \u0111\u1ed9 d\u00e0i c\u1ea1nh, ta c\u00f3:<\/p>\n
S = a x a = a\u00b2<\/strong><\/p>\n
V\u00ed d\u1ee5: M\u1ed9t h\u00ecnh vu\u00f4ng c\u00f3 c\u1ea1nh d\u00e0i 5 cm th\u00ec di\u1ec7n t\u00edch l\u00e0: S = 5 x 5 = 25 cm\u00b2.<\/em><\/p>\n
<\/picture><\/p>\n2.2. C\u00e1ch t\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng khi bi\u1ebft chu vi<\/h4>\n
N\u1ebfu \u0111\u1ec1 b\u00e0i cho chu vi (P) c\u1ee7a h\u00ecnh vu\u00f4ng, b\u1ea1n c\u1ea7n t\u00ecm \u0111\u1ed9 d\u00e0i c\u1ea1nh tr\u01b0\u1edbc, sau \u0111\u00f3 \u00e1p d\u1ee5ng c\u00f4ng th\u1ee9c c\u01a1 b\u1ea3n.<\/p>\n
- \n
- B\u01b0\u1edbc 1: T\u00ednh \u0111\u1ed9 d\u00e0i c\u1ea1nh (a).<\/strong>\u00a0V\u00ec chu vi P = a x 4, suy ra:\u00a0a = P \/ 4.<\/li>\n
- B\u01b0\u1edbc 2: T\u00ednh di\u1ec7n t\u00edch.<\/strong>\u00a0\u00c1p d\u1ee5ng c\u00f4ng th\u1ee9c:\u00a0S = a x a.<\/li>\n<\/ol>\n
V\u00ed d\u1ee5: M\u1ed9t h\u00ecnh vu\u00f4ng c\u00f3 chu vi 20 cm. C\u1ea1nh c\u1ee7a n\u00f3 l\u00e0 20 \/ 4 = 5 cm. Di\u1ec7n t\u00edch l\u00e0 S = 5 x 5 = 25 cm\u00b2.
<\/picture><\/em><\/p>\n2.3. C\u00e1ch t\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng khi bi\u1ebft \u0111\u01b0\u1eddng ch\u00e9o<\/h4>\n
V\u00ec h\u00ecnh vu\u00f4ng l\u00e0 h\u00ecnh thoi \u0111\u1eb7c bi\u1ec7t, ta c\u00f3 th\u1ec3 d\u00f9ng c\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch h\u00ecnh thoi qua hai \u0111\u01b0\u1eddng ch\u00e9o (d1, d2). Trong h\u00ecnh vu\u00f4ng, hai \u0111\u01b0\u1eddng ch\u00e9o b\u1eb1ng nhau (g\u1ecdi l\u00e0 d).<\/p>\n
C\u00f4ng th\u1ee9c l\u00e0:\u00a0S = \u00bd x (d x d) = d\u00b2 \/ 2<\/strong><\/p>\n
V\u00ed d\u1ee5: M\u1ed9t h\u00ecnh vu\u00f4ng c\u00f3 \u0111\u01b0\u1eddng ch\u00e9o d\u00e0i 10 cm. Di\u1ec7n t\u00edch c\u1ee7a n\u00f3 l\u00e0 S = (10 x 10) \/ 2 = 50 cm\u00b2.<\/em><\/p>\n
<\/picture><\/p>\n2.4. C\u00e1c ph\u01b0\u01a1ng ph\u00e1p suy lu\u1eadn kh\u00e1c<\/h4>\n
- \n
- T\u1eeb 2 tam gi\u00e1c vu\u00f4ng c\u00e2n:<\/strong>\u00a0M\u1ed9t \u0111\u01b0\u1eddng ch\u00e9o chia h\u00ecnh vu\u00f4ng th\u00e0nh 2 tam gi\u00e1c vu\u00f4ng c\u00e2n b\u1eb1ng nhau. Di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng b\u1eb1ng t\u1ed5ng di\u1ec7n t\u00edch 2 tam gi\u00e1c n\u00e0y.<\/li>\n
- T\u1eeb 2 h\u00ecnh ch\u1eef nh\u1eadt:<\/strong>\u00a0M\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng song song v\u1edbi m\u1ed9t c\u1ea1nh c\u00f3 th\u1ec3 chia h\u00ecnh vu\u00f4ng th\u00e0nh 2 h\u00ecnh ch\u1eef nh\u1eadt. Di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng b\u1eb1ng t\u1ed5ng di\u1ec7n t\u00edch 2 h\u00ecnh ch\u1eef nh\u1eadt \u0111\u00f3.
<\/picture><\/li>\n<\/ul>\n2.5. M\u1eb9o ghi nh\u1edb c\u00f4ng th\u1ee9c<\/h4>\n
\u0110\u1ec3 kh\u00f4ng b\u1ecb nh\u1ea7m l\u1eabn gi\u1eefa chu vi v\u00e0 di\u1ec7n t\u00edch, b\u1ea1n c\u00f3 th\u1ec3 ghi nh\u1edb m\u1eb9o sau:<\/p>\n
“Mu\u1ed1n t\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng,
\nC\u1ea1nh nh\u00e2n v\u1edbi ch\u00ednh n\u00f3, ta t\u00ecm ra.
\nChu vi th\u00ec t\u00ednh kh\u00e1c xa,
\nC\u1ea1nh nh\u00e2n v\u1edbi b\u1ed1n, th\u1ebf l\u00e0 xong ngay.”<\/em><\/p><\/blockquote>\n<\/picture><\/p>\nM\u1ed9t s\u1ed1 l\u01b0u \u00fd c\u1ea7n bi\u1ebft khi t\u00ednh v\u1ec1 di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng<\/span><\/h2>\n
D\u01b0\u1edbi \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 l\u01b0u \u00fd b\u1ea1n c\u1ea7n quan t\u00e2m khi \u00e1p d\u1ee5ng c\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh vu\u00f4ng \u1edf tr\u00ean.\u00a0<\/span><\/p>\n
- \n
- Khi t\u00ednh, c\u00e1c c\u1ea1nh ph\u1ea3i c\u00f9ng m\u1ed9t \u0111\u01a1n v\u1ecb \u0111o (ch\u1eb3ng h\u1ea1n nh\u01b0 m2, cm2\u2026). \u0110\u00e2y l\u00e0 nguy\u00ean t\u1eafc \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng cho b\u1ea5t k\u1ef3 c\u00f4ng th\u1ee9c t\u00ednh n\u00e0o trong to\u00e1n h\u1ecdc, t\u1ea5t c\u1ea3 c\u00e1c s\u1ed1 li\u1ec7u ph\u1ea3i c\u00f3 c\u00f9ng \u0111\u01a1n v\u1ecb \u0111o, n\u1ebfu nh\u01b0 \u0111\u1ec1 cho kh\u00e1c \u0111\u01a1n v\u1ecb, b\u1ea1n bu\u1ed9c ph\u1ea3i chuy\u1ec3n v\u1ec1 m\u1ed9t \u0111\u01a1n v\u1ecb chung nh\u01b0 cm2, m2\u2026 r\u1ed3i m\u1edbi th\u1ef1c hi\u1ec7n c\u00e1c b\u01b0\u1edbc t\u00ednh to\u00e1n kh\u00e1c nhau.\u00a0<\/span><\/li>\n
- Khi t\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng (hay b\u1ea5t k\u1ef3 di\u1ec7n t\u00edch h\u00ecnh h\u1ecdc n\u00e0o \u0111\u00f3), b\u1ea1n \u0111\u1ec1u s\u1eed d\u1ee5ng \u0111\u01a1n v\u1ecb \u0111o di\u1ec7n t\u00edch nh\u01b0 cm2 ho\u1eb7c m2, ch\u00fang ta kh\u00f4ng s\u1eed d\u1ee5ng di\u1ec7n t\u00edch th\u01b0\u1eddng nh\u01b0 m, cm\u2026\u00a0<\/span><\/li>\n
- C\u1ea7n n\u1eafm r\u00f5 v\u00e0 ph\u00e2n bi\u1ec7t c\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch v\u1edbi chu vi. Hai c\u00f4ng th\u1ee9c n\u00e0y th\u01b0\u1eddng b\u1ecb nh\u1ea7m l\u1eabn d\u1eabn \u0111\u1ebfn k\u1ebft qu\u1ea3 sai l\u00e0m \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn c\u1ea3 b\u00e0i to\u00e1n.\u00a0<\/span><\/li>\n
- B\u1ea1n c\u00f3 th\u1ec3 v\u1eadn d\u1ee5ng c\u00f4ng th\u1ee9c v\u00e0 t\u00ednh ch\u1ea5t c\u1ee7a c\u00e1c h\u00ecnh t\u1ee9 gi\u00e1c kh\u00e1c nh\u01b0 h\u00ecnh ch\u1eef nh\u1eadt, h\u00ecnh thang, h\u00ecnh thoi \u0111\u1ec3 t\u00ednh ra di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh vu\u00f4ng n\u1ebfu \u0111\u1ec1 kh\u00f4ng cho b\u1ea1n s\u1ed1 li\u1ec7u chi\u1ec1u d\u00e0i c\u1ea1nh.\u00a0<\/span><\/li>\n<\/ul>\n
<\/picture>C\u00e1c th\u00f4ng s\u1ed1 ph\u1ea3i c\u00f9ng \u0111\u01a1n v\u1ecb \u0111o<\/figcaption><\/figure>\n C\u00e1c d\u1ea1ng b\u00e0i t\u1eadp t\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng (c\u00f3 l\u1eddi gi\u1ea3i)<\/h2>\n
H\u00e3y c\u00f9ng th\u1ef1c h\u00e0nh qua c\u00e1c v\u00ed d\u1ee5 d\u01b0\u1edbi \u0111\u00e2y \u0111\u1ec3 n\u1eafm v\u1eefng ki\u1ebfn th\u1ee9c nh\u00e9!<\/p>\n
B\u00e0i t\u1eadp 1 (C\u01a1 b\u1ea3n):<\/strong>\u00a0M\u1ed9t t\u1edd gi\u1ea5y h\u00ecnh vu\u00f4ng c\u00f3 c\u1ea1nh d\u00e0i 100mm. T\u00ednh di\u1ec7n t\u00edch t\u1edd gi\u1ea5y theo \u0111\u01a1n v\u1ecb cm\u00b2.<\/p>\n
- \n
- L\u1eddi gi\u1ea3i:<\/strong>
\n\u0110\u1ed5i \u0111\u01a1n v\u1ecb: 100mm = 10cm.
\nDi\u1ec7n t\u00edch t\u1edd gi\u1ea5y l\u00e0: S = 10 x 10 = 100 cm\u00b2.<\/picture><\/li>\n<\/ul>\nB\u00e0i t\u1eadp 2 (T\u00ednh t\u1eeb chu vi):<\/strong>\u00a0Cho m\u1ed9t m\u1ea3nh \u0111\u1ea5t h\u00ecnh vu\u00f4ng c\u00f3 chu vi l\u00e0 72m. T\u00ednh di\u1ec7n t\u00edch m\u1ea3nh \u0111\u1ea5t \u0111\u00f3.<\/p>\n
- \n
- L\u1eddi gi\u1ea3i:<\/strong>
\n\u0110\u1ed9 d\u00e0i c\u1ea1nh c\u1ee7a m\u1ea3nh \u0111\u1ea5t l\u00e0: a = 72 : 4 = 18 m.
\nDi\u1ec7n t\u00edch m\u1ea3nh \u0111\u1ea5t l\u00e0: S = 18 x 18 = 324 m\u00b2.<\/li>\n<\/ul>\nB\u00e0i t\u1eadp 3 (Nh\u1eadn bi\u1ebft h\u00ecnh vu\u00f4ng):<\/strong>\u00a0M\u1ed9t h\u00ecnh thoi c\u00f3 m\u1ed9t g\u00f3c vu\u00f4ng v\u00e0 \u0111\u1ed9 d\u00e0i c\u1ea1nh l\u00e0 8cm. T\u00ednh di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh \u0111\u00f3.<\/p>\n
- \n
- L\u1eddi gi\u1ea3i:<\/strong>
\nTheo d\u1ea5u hi\u1ec7u nh\u1eadn bi\u1ebft, h\u00ecnh thoi c\u00f3 1 g\u00f3c vu\u00f4ng l\u00e0 h\u00ecnh vu\u00f4ng.
\nV\u1eady, di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh \u0111\u00f3 l\u00e0: S = 8 x 8 = 64 cm\u00b2.<\/li>\n<\/ul>\n<\/picture>B\u00e0i t\u1eadp 4 (B\u00e0i to\u00e1n t\u1ed5ng h\u1ee3p):<\/strong>\u00a0Ng\u01b0\u1eddi ta gh\u00e9p 9 m\u1ea3nh gi\u1ea5y h\u00ecnh vu\u00f4ng (m\u1ed7i m\u1ea3nh c\u00f3 c\u1ea1nh 5cm) l\u1ea1i v\u1edbi nhau \u0111\u1ec3 t\u1ea1o th\u00e0nh m\u1ed9t h\u00ecnh vu\u00f4ng l\u1edbn h\u01a1n. T\u00ednh di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh vu\u00f4ng l\u1edbn \u0111\u00f3.<\/p>\n- \n
- L\u1eddi gi\u1ea3i:<\/strong>
\nDi\u1ec7n t\u00edch m\u1ed9t m\u1ea3nh gi\u1ea5y nh\u1ecf l\u00e0: 5 x 5 = 25 cm\u00b2.
\nDi\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng l\u1edbn \u0111\u01b0\u1ee3c t\u1ea1o th\u00e0nh t\u1eeb 9 m\u1ea3nh nh\u1ecf l\u00e0: 25 x 9 = 225 cm\u00b2.<\/picture><\/li>\n<\/ul>\nB\u00e0i t\u1eadp 5 (B\u00e0i to\u00e1n th\u1ef1c t\u1ebf):<\/strong>\u00a0M\u1ed9t m\u1ea3nh \u0111\u1ea5t h\u00ecnh vu\u00f4ng \u0111\u01b0\u1ee3c m\u1edf r\u1ed9ng th\u00eam v\u1ec1 m\u1ed9t ph\u00eda 6m, t\u1ea1o th\u00e0nh m\u1ed9t m\u1ea3nh \u0111\u1ea5t h\u00ecnh ch\u1eef nh\u1eadt m\u1edbi c\u00f3 chu vi 112m. T\u00ednh di\u1ec7n t\u00edch m\u1ea3nh \u0111\u1ea5t h\u00ecnh ch\u1eef nh\u1eadt sau khi m\u1edf r\u1ed9ng.<\/p>\n
- \n
- L\u1eddi gi\u1ea3i:<\/strong>
\nG\u1ecdi c\u1ea1nh h\u00ecnh vu\u00f4ng ban \u0111\u1ea7u l\u00e0 ‘a’. M\u1ea3nh \u0111\u1ea5t m\u1edbi l\u00e0 h\u00ecnh ch\u1eef nh\u1eadt c\u00f3 c\u00e1c c\u1ea1nh l\u00e0 ‘a’ v\u00e0 ‘a+6’.
\nChu vi h\u00ecnh ch\u1eef nh\u1eadt: P = 2 x (a + (a+6)) = 112 => 2 x (2a + 6) = 112 => 2a + 6 = 56 => 2a = 50 => a = 25 m.
\nC\u1ea1nh h\u00ecnh vu\u00f4ng ban \u0111\u1ea7u l\u00e0 25 m.
\nC\u00e1c c\u1ea1nh c\u1ee7a m\u1ea3nh \u0111\u1ea5t m\u1edbi l\u00e0 25m v\u00e0 25+6 = 31m.
\nDi\u1ec7n t\u00edch m\u1ea3nh \u0111\u1ea5t sau khi m\u1edf r\u1ed9ng l\u00e0: 25 x 31 = 775 m\u00b2.<\/li>\n<\/ul>\nB\u00ean tr\u00ean l\u00e0 c\u00e1ch t\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng m\u00e0 b\u1ea1n c\u00f3 th\u1ec3 tham kh\u1ea3o. Hy v\u1ecdng b\u00e0i vi\u1ebft s\u1ebd h\u1eefu \u00edch v\u00e0 \u0111\u1eebng qu\u00ean chia s\u1ebb \u0111\u1ec3 m\u1ecdi ng\u01b0\u1eddi c\u00f9ng \u0111\u00f3n \u0111\u1ecdc, b\u1ea1n nh\u00e9!<\/span><\/p>\n
Xem th\u00eam:<\/span><\/p>\n
- \n
- C\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt ch\u00ednh x\u00e1c nh\u1ea5t<\/a><\/strong><\/li>\n
- C\u00e1ch gi\u1ea3i ph\u01b0\u01a1ng tr\u00ecnh b\u1eadc 2 nhanh ch\u00f3ng nh\u1ea5t<\/a><\/strong><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"
C\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng l\u00e0 m\u1ed9t ki\u1ebfn th\u1ee9c to\u00e1n h\u1ecdc c\u01a1 b\u1ea3n, \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng t\u1eeb gh\u1ebf nh\u00e0 tr\u01b0\u1eddng \u0111\u1ebfn c\u00e1c \u1ee9ng d\u1ee5ng th\u1ef1c t\u1ebf nh\u01b0 x\u00e2y d\u1ef1ng, thi\u1ebft k\u1ebf. N\u1eafm v\u1eefng c\u00e1ch t\u00ednh s\u1ebd gi\u00fap b\u1ea1n gi\u1ea3i quy\u1ebft c\u00e1c b\u00e0i to\u00e1n li\u00ean quan m\u1ed9t c\u00e1ch nhanh ch\u00f3ng v\u00e0 ch\u00ednh x\u00e1c. Trong […]<\/p>\n","protected":false},"author":97,"featured_media":298329,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3910,30453],"tags":[],"class_list":["post-298328","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-kham-pha","category-kien-thuc"],"yoast_head":"\n
C\u00e1ch T\u00ednh Di\u1ec7n T\u00edch H\u00ecnh Vu\u00f4ng - C\u00f4ng Th\u1ee9c, V\u00ed D\u1ee5 & 5+ B\u00e0i T\u1eadp C\u00f3 L\u1eddi Gi\u1ea3i<\/title>\n<meta name=\"description\" content=\"H\u01b0\u1edbng d\u1eabn chi ti\u1ebft c\u00e1ch t\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng v\u1edbi c\u00f4ng th\u1ee9c S = a x a. 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- C\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt ch\u00ednh x\u00e1c nh\u1ea5t<\/a><\/strong><\/li>\n
- L\u1eddi gi\u1ea3i:<\/strong>
- L\u1eddi gi\u1ea3i:<\/strong>
- L\u1eddi gi\u1ea3i:<\/strong>
- L\u1eddi gi\u1ea3i:<\/strong>
- Khi t\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng (hay b\u1ea5t k\u1ef3 di\u1ec7n t\u00edch h\u00ecnh h\u1ecdc n\u00e0o \u0111\u00f3), b\u1ea1n \u0111\u1ec1u s\u1eed d\u1ee5ng \u0111\u01a1n v\u1ecb \u0111o di\u1ec7n t\u00edch nh\u01b0 cm2 ho\u1eb7c m2, ch\u00fang ta kh\u00f4ng s\u1eed d\u1ee5ng di\u1ec7n t\u00edch th\u01b0\u1eddng nh\u01b0 m, cm\u2026\u00a0<\/span><\/li>\n
- T\u1eeb 2 h\u00ecnh ch\u1eef nh\u1eadt:<\/strong>\u00a0M\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng song song v\u1edbi m\u1ed9t c\u1ea1nh c\u00f3 th\u1ec3 chia h\u00ecnh vu\u00f4ng th\u00e0nh 2 h\u00ecnh ch\u1eef nh\u1eadt. Di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng b\u1eb1ng t\u1ed5ng di\u1ec7n t\u00edch 2 h\u00ecnh ch\u1eef nh\u1eadt \u0111\u00f3.
- B\u01b0\u1edbc 2: T\u00ednh di\u1ec7n t\u00edch.<\/strong>\u00a0\u00c1p d\u1ee5ng c\u00f4ng th\u1ee9c:\u00a0S = a x a.<\/li>\n<\/ol>\n
- N\u1ebfu l\u00e0 h\u00ecnh ch\u1eef nh\u1eadt c\u00f3 2 \u0111\u01b0\u1eddng ch\u00e9o vu\u00f4ng g\u00f3c v\u1edbi nhau, th\u00ec c\u00f3 th\u1ec3 x\u00e1c \u0111\u1ecbnh \u0111\u00f3 l\u00e0 h\u00ecnh vu\u00f4ng.<\/span><\/li>\n
- \u0110\u01b0\u1eddng tr\u00f2n n\u1ed9i ti\u1ebfp c\u00f3 t\u00e2m tr\u00f9ng v\u1edbi t\u00e2m c\u1ee7a \u0111\u01b0\u1eddng tr\u00f2n ngo\u1ea1i ti\u1ebfp v\u00e0 tr\u00f9ng t\u1ea1i giao \u0111i\u1ec3m c\u1ee7a hai \u0111\u01b0\u1eddng ch\u00e9o trong h\u00ecnh vu\u00f4ng.\u00a0<\/span><\/li>\n
- 2 \u0111\u01b0\u1eddng ch\u00e9o c\u1ee7a h\u00ecnh vu\u00f4ng c\u00f3 chi\u1ec1u d\u00e0i b\u1eb1ng nhau v\u00e0 c\u1eaft nhau t\u1ea1i trung \u0111i\u1ec3m c\u1ee7a 2 \u0111\u01b0\u1eddng. \u0110\u1ed3ng th\u1eddi, hai \u0111\u01b0\u1eddng ch\u00e9o \u0111\u00f3 khi g\u1eb7p nhau s\u1ebd vu\u00f4ng g\u00f3c v\u1edbi nhau.\u00a0<\/span><\/li>\n
![\"dien-tich-hinh-vuong-2\"](\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/dien-tich-hinh-vuong-2.jpg.webp)
<\/picture><\/p>\n![\"dien-tich-hinh-vuong-3\"](\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/dien-tich-hinh-vuong-3.jpg.webp)
<\/picture><\/p>\n![\"dien-tich-hinh-vuong-4\"](\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/dien-tich-hinh-vuong-4.jpg.webp)
<\/picture><\/p>\n![\"dien-tich-hinh-vuong-5\"](\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/dien-tich-hinh-vuong-5.jpg.webp)
<\/picture><\/em><\/p>\n![\"dien-tich-hinh-vuong-6\"](\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/dien-tich-hinh-vuong-6.jpg.webp)
<\/picture><\/p>\n![\"dien-tich-hinh-vuong-7\"](\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/dien-tich-hinh-vuong-7.jpg.webp)
<\/picture><\/li>\n<\/ul>\n![\"dien-tich-hinh-vuong-8\"](\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/dien-tich-hinh-vuong-8.jpg.webp)
<\/picture><\/p>\n![\"dien-tich-hinh-vuong-9\"](\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/dien-tich-hinh-vuong-9.jpg.webp)
<\/picture>![\"dien-tich-hinh-vuong-11\"](\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/dien-tich-hinh-vuong-11.jpg.webp)
<\/picture><\/li>\n<\/ul>\n![\"dien-tich-hinh-vuong-10\"](\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/dien-tich-hinh-vuong-10.jpg.webp)
<\/picture>B\u00e0i t\u1eadp 4 (B\u00e0i to\u00e1n t\u1ed5ng h\u1ee3p):<\/strong>\u00a0Ng\u01b0\u1eddi ta gh\u00e9p 9 m\u1ea3nh gi\u1ea5y h\u00ecnh vu\u00f4ng (m\u1ed7i m\u1ea3nh c\u00f3 c\u1ea1nh 5cm) l\u1ea1i v\u1edbi nhau \u0111\u1ec3 t\u1ea1o th\u00e0nh m\u1ed9t h\u00ecnh vu\u00f4ng l\u1edbn h\u01a1n. T\u00ednh di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh vu\u00f4ng l\u1edbn \u0111\u00f3.<\/p>\n![\"dien-tich-hinh-vuong-12\"](\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/webp-express\/webp-images\/uploads\/2023\/12\/dien-tich-hinh-vuong-12.jpg.webp)
<\/picture><\/li>\n<\/ul>\n