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A full circle is 360 degrees. 180 degrees is a half circle. 90 degrees is a quarter circle.
the distance around a circle
An 180 degrees circle is a semi-circle. A whole circle is 360 degrees.
How can a circle measure 180 degrees? Circles don't have any angles!
In degrees? If so then a full circle is 360 degrees, so a half circle is 180 degrees.