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On a circle, the "half-way" mark, is 180 degrees. That, in radians, is pi. The entire circle is 360 degrees or 2 pi.
A full circle is 360 degrees. 180 degrees is a half circle. 90 degrees is a quarter circle.
There are 360 degrees in a circle.
There are 360 degrees around a circle
An 180 degrees circle is a semi-circle. A whole circle is 360 degrees.