10-1: The Law of Cosines
10-1: The Law of Cosines. Essential Question: What is the law of cosines, and when do we use it?. 10-1: The Law of Cosines. In any triangle ABC, with side lengths a, b, c – which are opposite their respective angle, the Law of Cosines states: a 2 = b 2 + c 2 – 2bc cos A
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