1. Special Pairs of Angles
Section 2-4
Special Pairs of Angles

2. Complementary Angles are complementary angles
Two angles whose measures have the sum of 90 degrees 1 2
are complementary angles
Each angle is called the complement of the other.
Ex: is the complement of

3. Supplementary Angles are supplementary angles.
Two angles whose measures have the sum of 180 degrees 3 4
are supplementary
angles.
Each angle is called the supplement of the other.
Ex: is the supplement of

4. Need to know the following theorem:
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