{"id":34072,"date":"2026-10-14T17:41:38","date_gmt":"2026-10-14T10:41:38","guid":{"rendered":"https:\/\/etest.edu.vn\/?p=34072"},"modified":"2026-10-14T17:41:38","modified_gmt":"2026-10-14T10:41:38","slug":"perimeter-of-triangle-cong-thuc-tinh-chu-vi-tam-giac-va-cach-giai-bai-tap-sat-math","status":"publish","type":"post","link":"https:\/\/etest.edu.vn\/en\/perimeter-of-triangle-cong-thuc-tinh-chu-vi-tam-giac-va-cach-giai-bai-tap-sat-math\/","title":{"rendered":"Perimeter of Triangle: C\u00f4ng th\u1ee9c t\u00ednh chu vi tam gi\u00e1c v\u00e0 c\u00e1ch gi\u1ea3i b\u00e0i t\u1eadp SAT Math"},"content":{"rendered":"

Perimeter of Triangle (chu vi tam gi\u00e1c) l\u00e0 m\u1ed9t ki\u1ebfn th\u1ee9c h\u00ecnh h\u1ecdc c\u01a1 b\u1ea3n, nh\u01b0ng trong b\u00e0i thi SAT Math, d\u1ea1ng to\u00e1n n\u00e0y th\u01b0\u1eddng \u0111\u01b0\u1ee3c k\u1ebft h\u1ee3p v\u1edbi nhi\u1ec1u ch\u1ee7 \u0111\u1ec1 kh\u00e1c nh\u01b0 b\u1ea5t \u0111\u1eb3ng th\u1ee9c tam gi\u00e1c, tam gi\u00e1c \u0111\u1ed3ng d\u1ea1ng, h\u00ecnh h\u1ecdc t\u1ecda \u0111\u1ed9 v\u00e0 ph\u01b0\u01a1ng tr\u00ecnh \u0111\u1ea1i s\u1ed1. V\u00ec v\u1eady, \u0111\u1ec3 gi\u1ea3i b\u00e0i ch\u00ednh x\u00e1c v\u00e0 ti\u1ebft ki\u1ec7m th\u1eddi gian, h\u1ecdc sinh kh\u00f4ng ch\u1ec9 c\u1ea7n n\u1eafm v\u1eefng c\u00f4ng th\u1ee9c t\u00ednh chu vi m\u00e0 c\u00f2n ph\u1ea3i bi\u1ebft c\u00e1ch ph\u00e2n t\u00edch d\u1eef ki\u1ec7n, thi\u1ebft l\u1eadp ph\u01b0\u01a1ng tr\u00ecnh v\u00e0 v\u1eadn d\u1ee5ng c\u00e1c t\u00ednh ch\u1ea5t h\u00ecnh h\u1ecdc ph\u00f9 h\u1ee3p. Trong b\u00e0i vi\u1ebft n\u00e0y, b\u1ea1n s\u1ebd \u0111\u01b0\u1ee3c h\u1ec7 th\u1ed1ng h\u00f3a c\u00f4ng th\u1ee9c t\u00ednh chu vi theo t\u1eebng lo\u1ea1i tam gi\u00e1c, t\u00ecm hi\u1ec3u b\u1ed1n d\u1ea1ng b\u00e0i th\u01b0\u1eddng g\u1eb7p trong SAT Math, kh\u00e1m ph\u00e1 chi\u1ebfn l\u01b0\u1ee3c gi\u1ea3i nhanh v\u00e0 c\u1ee7ng c\u1ed1 ki\u1ebfn th\u1ee9c th\u00f4ng qua c\u00e1c b\u00e0i t\u1eadp minh h\u1ecda k\u00e8m l\u1eddi gi\u1ea3i chi ti\u1ebft.<\/span><\/p>\n

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Perimeter of Triangle: C\u00f4ng th\u1ee9c t\u00ednh chu vi tam gi\u00e1c v\u00e0 c\u00e1ch gi\u1ea3i b\u00e0i t\u1eadp SAT Math<\/figcaption><\/figure>\n

Perimeter of triangle l\u00e0 g\u00ec?\u00a0<\/b><\/h2>\n

Perimeter of triangle (chu vi tam gi\u00e1c) l\u00e0 t\u1ed5ng \u0111\u1ed9 d\u00e0i c\u1ee7a ba c\u1ea1nh, hay hi\u1ec3u \u0111\u01a1n gi\u1ea3n l\u00e0 \u0111\u1ed9 d\u00e0i \u0111\u01b0\u1eddng bao quanh tam gi\u00e1c. Chu vi th\u01b0\u1eddng \u0111\u01b0\u1ee3c t\u00ednh b\u1eb1ng c\u00e1c \u0111\u01a1n v\u1ecb \u0111\u1ed9 d\u00e0i nh\u01b0 cm, m ho\u1eb7c inch. Kh\u00e1c v\u1edbi chu vi, di\u1ec7n t\u00edch cho bi\u1ebft ph\u1ea7n m\u1eb7t ph\u1eb3ng n\u1eb1m b\u00ean trong tam gi\u00e1c v\u00e0 \u0111\u01b0\u1ee3c \u0111o b\u1eb1ng \u0111\u01a1n v\u1ecb b\u00ecnh ph\u01b0\u01a1ng nh\u01b0 cm\u00b2 ho\u1eb7c m\u00b2.\u00a0<\/span><\/p>\n

C\u00f4ng th\u1ee9c t\u1ed5ng qu\u00e1t<\/b><\/h4>\n

V\u1edbi tam gi\u00e1c c\u00f3 ba c\u1ea1nh a, b, c:<\/span><\/p>\n

P = a + b + c<\/b><\/p>\n

C\u00f4ng th\u1ee9c n\u00e0y \u0111\u00fang v\u1edbi m\u1ecdi lo\u1ea1i tam gi\u00e1c, mi\u1ec5n l\u00e0 ba \u0111\u1ed9 d\u00e0i th\u1eadt s\u1ef1 t\u1ea1o th\u00e0nh m\u1ed9t tam gi\u00e1c.<\/span><\/p>\n

B\u1ea5t \u0111\u1eb3ng th\u1ee9c tam gi\u00e1c (Triangle Inequality)<\/b><\/h4>\n

Ba \u0111o\u1ea1n th\u1eb3ng ch\u1ec9 gh\u00e9p \u0111\u01b0\u1ee3c th\u00e0nh tam gi\u00e1c khi t\u1ed5ng hai c\u1ea1nh b\u1ea5t k\u1ef3 lu\u00f4n l\u1edbn h\u01a1n c\u1ea1nh c\u00f2n l\u1ea1i:<\/span><\/p>\n