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an obtuse angle is greater than 90 degrees and less than 180 degrees
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.
Bertie
180 degrees is a straight line