How many degrees are in a right angle?

A right angle is defined as the angle that measures exactly 90 degrees. This measurement is fundamental in geometry, representing the angle formed when two lines or line segments intersect to create four equal angles. Among the provided options, 90 degrees is the only measurement that accurately describes a right angle. The understanding of a right angle is crucial in various applications, such as construction, carpentry, and navigation, where precise angles are required to ensure accuracy and structural integrity.