How many degrees are in a right angle?

A right angle is defined as an angle that measures exactly 90 degrees. This measurement signifies that the angle represents one-quarter of a full rotation, which is 360 degrees. In the context of geometry, right angles are fundamental because they form the basis for perpendicular lines and various geometric constructions.

The classification of angles often helps in understanding their function and relationship to shapes. For instance, complementary angles sum up to 90 degrees, reinforcing the significance of this specific measurement. In practical applications, right angles are crucial in fields such as architecture, engineering, and carpentry, where the precision of angles impacts structural integrity and design.

Thus, the correct answer of 90 degrees accurately describes the measure of a right angle.