{"id":6770,"date":"2019-04-02T17:48:42","date_gmt":"2019-04-02T10:48:42","guid":{"rendered":"https:\/\/thienhabet.com\/?p=6770"},"modified":"2020-08-13T07:26:28","modified_gmt":"2020-08-13T00:26:28","slug":"tam-hinh-la-gi","status":"publish","type":"post","link":"https:\/\/\/tam-hinh-la-gi","title":{"rendered":"Tam h\u00ecnh l\u00e0 g\u00ec ? C\u00f3 m\u1ea5y lo\u1ea1i tam h\u00ecnh ?"},"content":{"rendered":"

Tr\u01b0\u1edbc khi k\u1ebft duy\u00ean hay c\u00f9ng h\u1ee3p t\u00e1c l\u00e0m \u0103n, b\u1ea5t c\u1ee9 ai c\u0169ng d\u1ef1a v\u00e0o tu\u1ed5i tam h\u00ecnh \u0111\u1ec3 suy lu\u1eadn \u00fd ngh\u0129a phong th\u1ee7y, may r\u1ee7i, \u0111o\u00e1n \u0111\u1ecbnh h\u1ee3p tan ra sao. Nh\u01b0ng tr\u00ean th\u1ef1c t\u1ebf v\u1eabn c\u00f2n kh\u00e1 nhi\u1ec1u ng\u01b0\u1eddi ch\u01b0a hi\u1ec3u \u0111\u01b0\u1ee3c tam h\u00ecnh trong t\u1eed vi l\u00e0 g\u00ec v\u00e0 \u00fd ngh\u0129a c\u1ee7a ch\u00fang nh\u01b0 th\u1ebf n\u00e0o ? <\/span>Nh\u1eefng th\u00f4ng tin d\u01b0\u1edbi \u0111\u00e2y t\u1eeb nh\u00e0 c\u00e1i Thienhabet<\/strong><\/a> s\u1ebd cho b\u1ea1n nh\u1eefng ki\u1ebfn th\u1ee9c ph\u00f9 h\u1ee3p v\u00e0 b\u1ed5 \u00edch nh\u1ea5t.!<\/span><\/p>\n[toc]\n

Tam h\u00ecnh ngh\u0129a l\u00e0 g\u00ec ?<\/b><\/h2>\n

Trong quan h\u1ec7 phong th\u1ee7y, \u0111\u1ecba chi th\u00ec ch\u1eafc ch\u1eafn c\u00f3 m\u1ed9t kh\u00e1i ni\u1ec7m m\u00e0 c\u00e1c b\u1ea1n \u00edt bi\u1ebft \u0111\u00f3 l\u00e0 tam h\u00ecnh. Tam h\u00ecnh ch\u00ednh l\u00e0 quan h\u1ec7 t\u01b0\u01a1ng kh\u1eafc l\u1eabn nhau, ng\u01b0\u1eddi ph\u1ea1m tam chi s\u1ebd xung kh\u1eafc, trong c\u00f4ng vi\u1ec7c v\u00e0 cu\u1ed9c s\u1ed1ng \u0111\u1ec1u kh\u00f4ng thu\u1eadn l\u1ee3i. <\/span><\/p>\n

Nh\u1eefng ng\u01b0\u1eddi ph\u1ea1m v\u00e0o tam h\u00ecnh th\u01b0\u1eddng c\u00f3 b\u1ea3n m\u1ec7nh \u0111\u1ed1i l\u1eadp nhau, t\u01b0\u01a1ng kh\u1eafc nhau. Khi c\u00e1c m\u1ec7nh n\u00e0y g\u1eb7p nhau s\u1ebd g\u00e2y ra xung \u0111\u1ed9t kh\u00f4ng \u0111\u00e1ng c\u00f3, th\u1eadm ch\u00ed l\u00e0 nh\u1eefng hi\u1ec3u l\u1ea7m kh\u00f4ng th\u1ec3 n\u00e0o h\u00f3a gi\u1ea3i \u0111\u01b0\u1ee3c. V\u1eady c\u00e1c b\u1ea1n c\u00f3 bi\u1ebft <\/span>tam h\u00ecnh l\u00e0 g\u00ec<\/b>? Ch\u1eafc h\u1eb3n \u00edt ai t\u00ecm hi\u1ec3u v\u1ec1 ki\u1ebfn th\u1ee9c t\u00e2m linh n\u00e0y.<\/span><\/p>\n

Nh\u1eafc \u0111\u1ebfn\u00a0<\/span>tam h\u00ecnh<\/b>\u00a0ng\u01b0\u1eddi ta s\u1ebd nh\u1edb t\u1edbi \u0111\u00e2y l\u00e0 m\u1ed9t trong 3 lo\u1ea1i c\u1ee7a t\u01b0\u01a1ng h\u00ecnh. T\u01b0\u01a1ng h\u00ecnh g\u1ed3m c\u00f3<\/span>\u00a0t\u1ef1 h\u00ecnh<\/b>,\u00a0<\/span>nh\u1ecb h\u00ecnh<\/b>\u00a0v\u00e0\u00a0<\/span>tam h\u00ecnh<\/b>.\u00a0<\/span>Tam h\u00ecnh<\/b>\u00a0sinh ra t\u1eeb\u00a0<\/span>tam h\u1ee3p<\/b><\/a>, gi\u1ed1ng nh\u01b0\u00a0<\/span>l\u1ee5c h\u1ea1i<\/b>\u00a0\u0111\u01b0\u1ee3c sinh ra t\u1eeb\u00a0<\/span>l\u1ee5c h\u1ee3p<\/b>. Theo \u0111\u1ea1o tr\u1eddi hay c\u00e1c quy lu\u1eadt phong th\u1ee7y tam h\u00ecnh ch\u00ednh l\u00e0\u00a0<\/span>s\u1ed1 c\u1ef1c<\/b>, \u0111i\u1ec1u n\u00e0y \u0111\u01b0\u1ee3c hi\u1ec3u l\u00e0 nh\u1eefng ng\u01b0\u1eddi c\u00f3 t\u1ed9i \u00e1c \u0111\u1ea7y tr\u1eddi bu\u1ed9c ph\u1ea3i d\u1eabn t\u1edbi s\u1ef1 s\u1ee5p \u0111\u1ed5i theo \u0111\u00fang quy lu\u1eadt c\u1ee7a n\u00f3.<\/span><\/p>\n

\"Lu\u1eadn
Lu\u1eadn tam h\u00ecnh trong phong th\u1ee7y<\/figcaption><\/figure>\n

Tam h\u00ecnh \u0111\u01b0\u1ee3c chia l\u00e0m m\u1ea5y lo\u1ea1i ?<\/b><\/h2>\n

Quan ni\u1ec7m tam h\u00ecnh \u0111\u00e3 \u0111\u01b0\u1ee3c gi\u1ea3i m\u00e3 \u1edf tr\u00ean. T\u01b0\u01a1ng t\u1ef1 nh\u01b0 c\u00e1c m\u00f4 h\u00ecnh tam h\u1ee3p, l\u1ee5c h\u1ee3p. S\u1ee9c m\u1ea1nh c\u1ee7a tam h\u00ecnh l\u00e0 s\u1ef1 k\u1ebft h\u1ee3p ho\u00e0n h\u1ea3o gi\u1eefa c\u00e1c cung s\u1ed1 ph\u00f9 h\u1ee3p v\u1edbi nhau. C\u00e1c cung s\u1ed1 n\u00e0y mang \u0111\u1ebfn s\u1ef1 t\u01b0\u01a1ng quan t\u1ed1t \u0111\u1eb9p.<\/span><\/p>\n

N\u1ebfu bi\u1ebft v\u1eadn d\u1ee5ng tam h\u00ecnh trong cu\u1ed9c s\u1ed1ng s\u1ebd mang \u0111\u1ebfn nh\u1eefng \u0111i\u1ec1u may m\u1eafn cho ng\u01b0\u1eddi \u00e1p d\u1ee5ng. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 c\u00e1c lo\u1ea1i tam h\u00ecnh<\/strong> theo lu\u1eadn phong th\u1ee7y m\u00e0 b\u1ea1n n\u00ean tham kh\u1ea3o. \u0110\u1ec3 c\u00f3 k\u1ebft qu\u1ea3 chu\u1ea9n ch\u00ednh x\u00e1c nh\u1ea5t. H\u00e3y \u0111\u1ecdc k\u1ef9 c\u00e1c y\u00eau c\u1ea7u c\u1ee7a m\u1ed7i lo\u1ea1i tam h\u00ecnh khi k\u1ebft h\u1ee3p.<\/span><\/p>\n

Lo\u1ea1i 1: D\u1ea7n \u2013 t\u1ef5 \u2013 th\u00e2n (T\u01b0\u01a1ng h\u00ecnh theo chi\u1ec1u kim \u0111\u1ed3ng h\u1ed3)<\/b><\/h3>\n

H\u00ecnh th\u1ee9c tam h\u00ecnh n\u00e0y ch\u00ednh l\u00e0 s\u1ef1\u00a0xung kh\u1eafc\u00a0gi\u1eefa 3 con gi\u00e1p theo chi\u1ec1u kim \u0111\u1ed3ng h\u1ed3 c\u1ee5 th\u1ec3 nh\u01b0 sau:<\/span><\/p>\n