How many degrees are in a straight angle?

A straight angle is defined as one that forms a straight line, hence the name "straight angle." This angle effectively represents half of a full rotation around a point, which is 360 degrees. When you divide 360 degrees by 2, you arrive at 180 degrees.

Therefore, a straight angle represents a situation where the two rays of the angle lie exactly opposite each other, creating a straight line. This property is fundamental in geometry and is crucial for understanding lines and angles in more complex figures. Recognizing that a straight angle measures 180 degrees is key when working with various geometric principles and theorems.

Other options represent different angles: a right angle measures 90 degrees, a full rotation (or complete angle) is 360 degrees, and while 270 degrees is not directly related to a straight angle, it represents three-quarters of a full rotation. Understanding the attributes of angles allows for a clearer grasp of geometric concepts and relationships.