Generalization of the Pythagorean theorem relating the lengths of the sides of any triangle.
If &math.a;, &math.b;, and &math.c; are the lengths of the sides and &math.C; is the angle opposite side &math.c;, then &math.c;2 = &math.a;2 + &math.b;2 − 2&math.a;&math.b; cos &math.C;.
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