What is the term for angles that add up to 180 degrees?

The correct term for angles that add up to 180 degrees is supplementary angles. When two angles are classified as supplementary, their measures combine to equal exactly 180 degrees, which can occur whether they are adjacent or not. This property is essential in various geometric applications, especially when working with lines and angles formed by transversal intersections.

In contrast, complementary angles are those that add up to 90 degrees. Adjacent angles are angles that share a common side and a vertex but are not necessarily supplementary. Vertical angles are formed opposite each other when two lines intersect, and while they are equal in measure, they do not have a specific requirement to sum to 180 degrees. Understanding these definitions helps clarify the distinctions between different types of angles in geometry.