2-4 Special Pairs of Angles

**Definitions:**

**Complementary**

**angles**

If

**two angles**are

**complementary angles**then the

**two angles**sum are 90 degrees

**Supplementary**

**angles**

If

**two angles**are

**supplementary angles**then the

**two angles**sum are 180 degrees

**Vertical**

**angles**

If two angles are

**vertical angles**then the angles are 2 angles such that the sides of one angle are opposite rays to the sides of the other angle

Note: The sides of the angles have to form 2 intersecting lines

A theorem for vertical angles

If two angles are vertical angles then they are congruent (or equal)

In short we can write:

If two angles are vertical angles then they are congruent (or equal)

In short we can write:

**Vertical angles are congruent**