Geometry

Question Analysis

The main focus is using trigonometric functions in right - triangle (where ) to find the length of side . Given and the length of the hypotenuse , we need to determine the length of the side adjacent to .

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. Identify the relevant trigonometric function:

Since we know the hypotenuse and want to find the adjacent side to the given angle, we use the cosine function. The formula is .

2. Substitute the known values:

Given and

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