Geometry

Question Analysis

This question focuses on applying trigonometric functions in a right - triangle. The main task is to determine the correct trigonometric ratio to find the length of side given an angle and the length of the hypotenuse.

 

Key Concept Explanation

In a right - triangle:

 

Step - by - Step Solution

We have a right - triangle with an angle of , the hypotenuse has length , and the side we want to find, , is the side adjacent to the angle.

Using the cosine function, since , substituting , , and , we get .

 

Option Analysis

A.Cos

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