Definition:Angle/Unit

Definition
The usual units of measurement for angle are as follows:

Also see

 * Pi ($\pi$)


 * Full Angle measures $2 \pi$ Radians

In the context of calculus in particular, it is usual to use radians.

This is because then the derivatives of trigonometric functions, such as, for example:
 * $\dfrac \d {\d x} \sin x = \cos x$

work out without the necessity of multiplicative constants.