How many degrees are in a right angle?

A right angle measures precisely 90 degrees. This measurement is a fundamental concept in geometry and is defined as the angle formed when two lines are perpendicular to each other.

Understanding the significance of a right angle is crucial, as it serves as a basis for constructing various geometric shapes and concepts, such as squares and rectangles, where right angles ensure that corners are exactly as intended. Recognizing that a right angle is one-quarter of a full rotation, which is 360 degrees, helps in visualizing its relation to other angles, as well. Thus, the choice reflecting 90 degrees accurately identifies the value representing a right angle.