Two angles are called complementary when their measures add to 90 degrees. Two angles are called supplementary when their measures add up to 180 degrees.
If sum of two angles equals 90 ∘ then the two angles are said to be complementary. If sum of two angles equals 180 ∘ then the two angles are said to be supplementary. Verticall Angles are the angles opposite each other when two lines cross. They are always equal. "Vertical" in this case means they share the same Vertex (corner point), not the usual meaning of up-down.
