Question

I need help finding the missing side.

Answer 1

x ≈ 25.1

Explanation:

Using the cosine ratio in the right triangle, that is

cos64° =
`(adjacent)/(hypotenuse)` =
`(11)/(x)` ( multiply both sides by x )

x × cos64° = 11 ( divide both sides by cos64° )

x =
`(11)/(cos64)` ≈ 25.1 ( to the nearest tenth )