Right angles measure 90 degrees. Angles less than 90 are called acute, and angles greater than 90 are called obtuse. Once you reach 180 degrees, you have formed a straight line. 360 degrees makes a circle.
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An angle that measures to precisely 90o is called a right angle.
An angle that measures more than 90 degrees is called an obtuse angle.
Acute is < 90 degrees.
If it measures 90 degrees, then it is called a right angle.
A right angle.