In Section 1-5, we learned about the different types of angle pairs and relationships. The different types of angle pairs are: adjacent angles, vertical angles, and linear pairs.


Adjacent angles are two angles that lie on the same plane, have a common vertex and common side, but no common interior points. Note that, both of the angles will always equal the total measure when added together.

Vertical angles are two nonadjacent (no common side)angles formed by two intersecting lines. The angles opposite each other will always be the same.

A Linear pair is a pair of adjacent angles with noncommon sides that are opposite rays. Both of the angles will always add up to 180 degrees.

The different types of angle relationships are: complimentary angles and supplementary angles.



Complimentary angles are two angles that have a sum of 90 degrees.

While, supplementary angles are two angles that have a sum of 180 degrees.