Geometry

Question Analysis  

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

 

Key Concept Explanation  

The Law of Cosines formula for an angle is , where is the angle between sides and , and is the side opposite . For , the sides adjacent are and , and the opposite side is . Thus, .  

 

Step-by-Step Solution  

1. Identify values: Let , , .  

2. Calculate:  

Squares:

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