A right angle
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An angle of 90 degrees is normally called a right angle.An angle of 90 degrees is a right angle
An angle which measure exactly 90 degrees is called a right angle.
An angle of more than 90 degrees is called an "obtuse" angle. Strictly speaking an obtuse angle is from 90 to 180 degrees.
An angle less than 90 degrees is called an acute angle.
An angle that is between 90 degrees and 180 degrees is called an obtuse angle. Ex. : 175 degrees, 140 degrees.