Geometry

Question Analysis

We need to find the length of side  in  using the Law of Cosines, given two side lengths (, ) and the included angle ().

 

Key Concept Explanation

The Law of Cosines states that for a triangle with sides , ,  and the angle  opposite side , . In , to find side  (let , , , ), we use .

 

Step - by - Step Solution

1. Identify the values: Let , ,

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