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An angle measuring exactly 90 degrees is 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'.)
An angle measuring more than 90 degrees is obtuse. An angle measuring less than 90 degrees is acute. An angle measuring 90 degrees is right.
An angle measuring more than 90 degrees is considered an obtuse angle. However, if the angle is exactly 180 degrees, then it is considered a straight angle.
A right angle is an angle of 90 degrees.