The cos⁻¹ function takes the answer to adjacent ÷ hypotenuse (in this example, 16/32), and gives the angle Ɵ. To find Ɵ, calculate cos⁻¹ (16/32). Image caption, To write cos⁻¹ on a ...

In other words: The tangent of angle A = the length of the opposite side divided by the length of the adjacent side The sine ... an inverse that can be used to find an angle from a ratio of ...