The two most common measurements of angles are degrees and radians. Remember from Technical Mathematics 1 that a degree is of a circle, and a radian is of a circle. An entire circle contains 360° or radians.
To convert from degrees to radians, multiply the number of degrees by
To convert from radians to degrees, multiply the number of radians by
Convert 72° to radians
Convert radians to degrees
We can evaluate trigonometric functions which are in degrees or radians. If you are using a calculator, remember to have it in the proper mode.
3) cos = -0.9135