Two coplanar angles that have a common side between them but have no interior points in common.
Adjacent Angles
Pair of angles whose sum is equal to 90 degrees.
Complementary Angles
Non-adjacent angles formed by two intersecting lines.
Vertical Angles
Pair of angles which are adjacent and supplementary to each other.
Linear Pair
Pair of angles whose sum is equal to 180 degrees.
Supplementary Angles