Calculating Angles with Sine, Cosine and Tangent

We have seen that the Sine, Cosine and Tangent ratios allow us to find unknown sides in a triangle. We can also use them to find unknown angles if we are given two sides.

In order to calculate angles, we need to use a new function. The Sine, Cosine or Tangent of an angle is not the same as the angle itself. We can find the angle itself by using the inverse:

$(sin^{-1}) \space or \space (cos^{-1}) \space or \space (tan^{-1}) \space$