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Section 2-4 Special Pairs of Angles Complementary Angles • Two angles whose measures have the sum of 90 degrees 1and2 are complementary angles 1 2 Each angle is called the complement of the other. Ex: 1 is the complement of 2 Supplementary Angles • Two angles whose measures have the sum of 180 degrees 3and4 3 4 are supplementary angles. Each angle is called the supplement of the other. Ex: 3 is the supplement of 4 Vertical Angles • Formed when two lines intersect. Need to know the following theorem: Vertical Angles are Congruent. In other words, vertical angles have the same angle measure. 1 2