angle definitions

vertical angle : two non-adjacent angles formed by intersecting lines

complementary angles : two angles whose measures add to 90

corresponding angles (CA) : On parallel lines these two angles are on the SAME side of the transverse and the same side of the parallel lines. They are EQUAL. What are they called?

alternate interior angles (AIA) : Angles that lie within a pair of lines and on opposite side of a transversal.