a "right angle"
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If it measures 90 degrees, then it is called a right angle.
An angle that measures more than 90 degrees is called an obtuse angle.
A right angle
An angle which measures 90 degrees is called a right angle. An angle of less than 90 degrees is an acute angle and one which is more than 90 degrees is an obtuse angle.
A right angle is exactly 90 degrees.