Geometry

Question Analysis

This question requires using the Law of Cosines to find the length of side  in , given two side lengths and the included angle.

 

Key Concept Explanation

The Law of Cosines: 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. Apply the Law of Cosines:

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