"Degree" is a unit commonly used when measuring an angle. The symbol for degrees is "°".

The measure of an angle is a number representing the spread of the two arms of the angle.

360° is equivalent to one "revolution" (r). Given either a number of degrees or a number of revolutions, the other "unit" can be found by using equivalent ratios.

An angle with a measure of 1° is shown in the the illustration below.

Common benchmark angles in degrees are shown below.