How many degrees are in a straight angle?

A straight angle is defined as an angle that forms a straight line. By geometric conventions, it measures exactly 180 degrees. This is because when you have two rays originating from the same endpoint and extending in opposite directions, they create a straight line, thus indicating an angle of 180 degrees.

In contrast, a 90-degree angle, known as a right angle, represents a quarter turn, while a 360-degree angle denotes a complete rotation. A 270-degree angle is three-quarters of a rotation. Therefore, in the context of angles, a straight angle is specifically designated as 180 degrees due to its relationship with linear geometry.