lunsheng @ ウィキ

Law of Cosines

Let a, b, and c be lines in relation to angle A, B, and C of the triangle ABC respectively.
Then, following formula exists,

$\cos A = \frac{-a^2 + b^2 + c^2}{2bc}$ .

Refer to this page

最終更新：2009年11月11日 22:50