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Obtuse, acute, straight, and right angle.
0-90o is an acute angle. 90o is a right angle. 90-180o is an obtuse angle. 180-360o is a reflex angle. There are only 4 angle names.
A rectangle or a square: both have four sides and a right-angle of 90 degrees forming the four corners.
90 degrees is the measure of a right angle
1. Acute Angle 2. Right Angle 3. Obtuse Angle