Geometry

Question Analysis

The main focus is using the cosine function in a right - triangle to find the value of an unknown side given an angle of and the hypotenuse of length .

Key Concept Explanation

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

Step - by - Step Solution

1. Given the equation .

Multiply both sides of the equation by to solve for . So,

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