if two angles are supplementary, which is the sum of their measurements?
Definitions:Complementary angles are two angles with a sum of 90Âº. Supplementary angles are two angles with a sum of 180Âº. Vertical angles are two angles whose sides form two pairs of opposite rays. We can think of these as opposite angles formed by an X. In the triangle shown below, the angles A and B are complementary because they have a sum of 90Âº. This is obvious since angle C is 90Âº and the other two angles must have a sum of 90Âº so that the three angles in the triangle together have a sum of 180Âº.