Degree Symbol in Math

A degree indicated by ° (the degree symbol), is used as the unit of angle measure defined that a full rotation is 360 degrees. Which means there are 360 degrees in a full rotation. So half a circle indicates 180° called a Straight Angle; as well as a quarter of a circle is 90° called a Right Angle. We can use a protractor to measure degrees. A standard protractor measures 0° to 180°. But full-circle protractors can measure 0° to 360°.