Geometry

Question Analysis

This question focuses on applying the cosine trigonometric function in a right - triangle. The main task is to solve for the unknown side given the value of and the length of the hypotenuse.

Key Concept Explanation

In a right - triangle, the cosine of an angle is defined as . Here, , the hypotenuse has a length of , and the side adjacent to the angle is .

Step - by - Step Solution

1. Given the equation .

2. To solve for , we multiply both sides of the equation by . This gives us

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