How many degrees are in a right angle?

A right angle is defined as an angle that measures exactly 90 degrees. It is one of the fundamental concepts in geometry and is used extensively in various mathematical contexts, including the definitions of perpendicular lines and the properties of shapes. In the context of a circle, a right angle represents one-quarter of the full rotation, which is 360 degrees. This key characteristic helps establish the basis for many other geometric principles and shapes, such as rectangles and squares, which are formed by right angles at their corners.