An angle greater than 90 but less than 180 degrees is an obtuse angle
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An angle which measures between 180 and 360 degrees is called a reflex angle.
It is called a reflex angle.
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.
Reflex
in complex math the name for a 180 degree angle would be called a straight line