Complementary Angle: A pair of angles is said to be complementary if the sum of their measures is equal to 90o and each angle is said to be the complement of the other
Supplementary Angle: If the sum of the measures of a pair of angles is equal to 180o, then it is called a supplementary angle
Adjacent Angle: Two angles are said to be adjacent if they have a common arm and a common vertex and their non-common arm lies on the opposite sides of the common arm
Linear Pair: A pair of adjacent angles is said to be forming linear pairs if the sum of the adjacent angles is equal to 180o, i.e., which is possible only when the non-common arms of the pair of adjacent angles form opposite rays. It is a special case of adjacent angles.