If two angles are <u><em>complementary</em></u>, then the
sum of their measures is 90 degrees.
For example, if we have a 30° angle and a 60° angle, these two angles
are complementary because the sum of their measures is 90 degrees.
If two angles are <u><em>supplementary</em></u>, then the
sum of their measures is 180 degrees.
For example, if we have a 100° angle and an 80° angle,
then these two angles are supplementary because
the sum of their measures is 180 degrees.