An angle that is 180 degrees would be considered a straight angle. 90 degrees is a right angle, anything less would be an acute angle and anything more would be obtuse.
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the angle and its supplementary angle added together is 180 the supplementary angle of angle y is 180-y
because INTERIOR ANGLE 180 AND the exterior angle 180 so 180+180=360
It is also a right angle Supplement = 180 - angle = 180-90 = 90 = right 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° is a straight line.