The Law of Cosines
The Law of Cosines. The Law of Cosines. If A , B , mid C are the measures of the angles of a triangle, and a , b , and c are the lengths of the sides opposite these angles, then a 2 = b 2 + c 2 - 2 bc cos A b 2 = a 2 + c 2 - 2 ac cos B c 2 = a 2 + b 2 - 2 ab cos C .
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