A 90-degree angle is also referred to as a right angle.
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An angle which measure exactly 90 degrees is called a right angle.
An angle which measures exactly 90 degrees is called a "right" angle. (One measuring less than 90 is 'acute', and one measuring more than 90 degrees is 'obtuse'.)
A right angle is an angle of 90 degrees.
An angle measuring exactly 90 degrees is a right angle.
geometry