Sal is given a triangle with all side lengths but no angle measure, and he finds one of the angle measures using the law of cosines.
Law of cosines is a free educational video by Khan Academy.It helps students in grades 9,10,11,12 practice the following standards HSG.SRT.D.10.
1. HSG.SRT.D.10 : Prove the Laws of Sines and Cosines and use them to solve problems.
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