Geometry

Question Analysis

In , we know two sides , , and the included angle . The task is to find side  (opposite ) using the Law of Cosines.

 

Key Concept Explanation

The Law of Cosines states that for a triangle with sides , ,  and the angle  opposite side , . This formula is useful for finding a side when two sides and the included angle are known.

 

Step - by - Step Solution

1. Identify the values: Let , , and , so .

2. Substitute into the Law of Cosines formula:

Click "Show Answer" to reveal the answer and analysis