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law of cosines
(redirected from Cos law)

    Also found in: Wikipedia 0.01 sec.

law of cosines

Generalization of the Pythagorean theorem relating the lengths of the sides of any triangle. If a, b, and c are the lengths of the sides and C is the angle opposite side c, then c2 = a2 + b2 − 2ab cos C.

law of cosines [′lȯ əv ′kō‚sīnz]
(mathematics)
Given a triangle with anglesA, B,andCand sidesa, b, copposite these angles respectively:a2=b2+c2- 2bccosA.


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