Geometry

Question Analysis

This question is about applying trigonometric functions in a right - triangle. The key is to identify the correct trigonometric ratio to find the length of side given an angle and the length of another side.

 

Key Concept Explanation

In a right - triangle:

 

Step - by - Step Solution

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

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

 

Option Analysis

A.Sin

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