Geometry

Question Analysis

The problem aims 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 , . Here, to find  (side ), we use .

 

Step - by - Step Solution

1. Identify values: Let , , .

2. Calculate:

,

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