It is a straight line because angles on a straight line add up to 180 degrees but angles greater than 180 degrees are reflex angles
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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.
An angle of 180° is a straight line.
180 degrees is a straight line
An angle which is more than 180 degrees but less than 360 degrees is called a reflex angle.
Reflex