Geometry

Question Analysis  

The problem requires using the Law of Cosines to find the measure of  in , given all three side lengths (, , ).  

 

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 . In , to find  (opposite ), use .  

 

Step-by-Step Solution  

1. Identify values: Let ,

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