Question

How to calculate a missing side in a right triangle with a angle and a side length?

Answer 1

Use the Trigonometric ratios. In the picture below, there are three different equations to help solve it.

1. sinθ = y/r (opposite/hypotenuse) = 1/cscθ
2. cosθ = x/r (adjacent/hypotenuse) = 1/secant θ
3. tanθ = y/x (opposite/adjacent) = 1/cotθ