Geometry

Question Analysis

This problem involves using the Law of Cosines to find  in , given the lengths of all three sides (, , ).

 

Key Concept Explanation

The Law of Cosines can be rearranged to find an angle. For , .

 

Step - by - Step Solution

1. Identify the values: Let , , .

2. Apply the Law of Cosines for the angle:

First, calculate the squares: , ,

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