straight angle.
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It is a reflex angle that is between 180 and 360 degrees.
obtuse angle
An angle greater than 90 but less than 180 degrees is an obtuse 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.
An angle of 180 degrees is a straight line.