An angle that measures 180 degrees is a straight angle, or straight line.
Line.
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An angle that measures 180 degrees is called a straight angle.
A straight angle measures 180 degrees.
An angle that measures 300 degrees is called a "reflex angle." A reflex angle is an angle that is greater than 180 degrees but less than 360 degrees. In this case, a 300-degree angle is greater than a straight angle (180 degrees) but less than a full rotation (360 degrees).
Angles between 90 and 180 degrees are called obtuse.
137 degrees is an obtuse angle because it is greater than 90 but less than 180 degrees.