# Trigonometry Examples

Step 1

The cosine of an angle is equal to the ratio of the adjacent side to the hypotenuse.

Step 2

Substitute the name of each side into the definition of the cosine function.

Step 3

Set up the equation to solve for the adjacent side, in this case .

Step 4

Substitute the values of each variable into the formula for cosine.

Step 5

Multiply by .