Which type of angles have a sum that equals 180 degrees?

Supplementary angles are defined as two angles whose measures add up to 180 degrees. This property is fundamental in geometry and plays a crucial role in various mathematical concepts, including understanding linear pairs and the relationships between angles formed when two lines intersect.

In the context of angles, acute angles are those that measure less than 90 degrees, while complementary angles are specifically pairs of angles that sum to 90 degrees. Adjacent angles refer to angles that share a common side and a common vertex, but that doesn’t imply that their measures will sum to a specific value. Therefore, while these other types of angles have their own distinct characteristics, it is the supplementary angles that meet the criterion of having a sum equal to 180 degrees, making them the correct answer in this case.