It's a Reflex Angle.
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An angle of between 90 degrees and 180 degrees is called an obtuse angle, an angle that is exactly 180 degrees is called a straight angle (because it creates a straight line), and an angle of more then 180 degrees is called a reflex angle.
180 degrees is a straight line
Supplementary angles add up to 180 degrees
Reflex
How can a circle measure 180 degrees? Circles don't have any angles!