How many degrees are in a complete circle?

A complete circle is defined as a full rotation around a point. The measurement of angles in a circle is typically expressed in degrees, and a standard measurement for a complete turn is 360 degrees. This means that if you start at a point on the circle and make one full rotation back to the same point, you will have traced out an angle of 360 degrees.

The other choices represent angles that are less than or exceed a full circle. For example, 180 degrees corresponds to a half-circle, while 90 degrees represents a quarter of a circle. Lastly, 540 degrees indicates one and a half rotations around the circle. Thus, 360 degrees is the only correct measurement for a complete circle.