Vertical Angles and Linear Pairs
Figure 1
When you change the size of AED what do you notice about CEB?
In the question above, <AED and <CEB are Vertical Angles.
List another pair of vertical angles in the diagram.
What is the relationship between <AED and <DEB?
In the diagram above <AED and <DEB are called a Linear Pair.
What angle is a linear pair with <AEC?