Geometry

Question Analysis

This problem requires using the Law of Cosines to find the length of side  in , given the length of two sides (, ) 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: ,