There are 180 degrees in a semi-circle.
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Quarter: 90 degrees semi: 180 degrees
360 degrees and 180 degrees respectively
Here's a statement that may or may not answer the question ... it's hard to tell: When you sit at the center of a semicircle, its ends are 180 degrees apart as seen from your viewpoint.
the angle on a straight line is 180 degrees, the angle of semicircle at centre is 180 degrees
there are two angles