How many degrees are in a semicircle?

A semicircle is defined as half of a full circle. Since a complete circle contains 360 degrees, dividing this measure by 2 gives you the angle in a semicircle. Therefore, 360 degrees divided by 2 equals 180 degrees, which confirms that a semicircle indeed measures 180 degrees. This understanding of the relationship between the total degrees in a circle and its segments is vital in geometry, especially when dealing with problems involving angles and arcs.