How can a circle measure 180 degrees? Circles don't have any angles!
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180 degrees is a straight line
Supplementary angles add up to 180 degrees
The question probably refers to the internal angles of a triangle which total 180° . Also, the angle at the centre of a circle and subtended by half the circle is 180°.
A full circle is 360 degrees. 180 degrees is a half circle. 90 degrees is a quarter circle.