A right angle = 90 degrees
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An angle of 90 degrees is a right angle.
An angle of 90 degrees is known as a right angle.
A right angle is exactly 90 degrees
90 degrees is the measure of a right angle
The angle with measure more than 0 degrees and less than 90 degrees is an acute angle, the angle with measure 90 degrees is a right angle,the angle with measure more than 90 degrees and less than 180 degrees is an obtuse angle and the angle with measure 180 degrees is a straight angle. Finally, an angle of more than 180 degrees and less than 360 degrees is a reflex angle.