How many degrees are in a straight angle?

A straight angle is defined as an angle that measures exactly 180 degrees. This can be visualized as a straight line where the two rays forming the angle extend in opposite directions. At this point, the angle does not open or close; instead, it remains in a single straight path, thus representing a half-turn.

In geometric terms, when you think about a full rotation (360 degrees), a straight angle represents exactly half of that full rotation. Therefore, the definition and properties of angles confirm that a straight angle is indeed 180 degrees. This makes it a fundamental concept in geometry, particularly when discussing types of angles and their measurements.