What Are The Different Types Of Angles Called?: I Wonder... Math Series.

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A right angle is an angle that measures 90 degrees. An acute angle is one that measures less than 90 degrees. An obtuse angle is one that measures greater than 90 degrees, but less than 180 degrees. A reflex angle is an angle that measures greater than 180 degrees. An angle that measures exactly 180 degrees is called a straight angle.