How many degrees are in a right angle?

A right angle is defined as an angle that measures exactly 90 degrees. This specific measurement is fundamental in geometry and can be recognized in various applications, such as in the corner of a square or rectangle.

Understanding that a right angle divides the circle into four equal parts is essential, as the total degrees in a full circle are 360. Therefore, each quarter of the circle corresponds to 90 degrees. This measurement is not open to interpretation and is universally accepted in mathematical definitions.

The other options represent different types of angles: 45 degrees is classified as an acute angle, 120 degrees is an obtuse angle, and 180 degrees represents a straight angle. Each of these has distinct definitions and applications, further solidifying that the measure of a right angle remains precisely 90 degrees.