cosine rule

In triangles, length of side c opposite angle C relates to other-two side lengths a b {law of cosines} {cosine law} {cosine rule}: c^2 = a^2 + b^2 - 2 * a * b * cos(C). If opposite angle is right angle, making right triangle, cos(C) = 0 and c^2 = a^2 + b^2, the Pythagorean theorem.

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