Geometry

Question Analysis

The problem requires finding the measure of  in  using the Law of Cosines, with the lengths of all three sides (, , ) provided.

 

Key Concept Explanation

The Law of Cosines states that for a triangle with sides , ,  and the angle  opposite side , . Rearranging this formula to find an angle gives . For , to find , we use , as we know the side lengths and aim to find the angle opposite side .

 

Step - by - Step Solution

1. Identify values: Let , ,

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