The Definition of an Angle
This section will cover the fundamentals and rules of an angle.
An angle is a plane figure where two rays share a common point.  
Example 1: 
Two lines that intersect form four angles.  
Example 2: 
Determine the Measure of an Angle
When two lines intersect, they create vertical angles where their pair of angles opposite each other are equal. 
When parallel lines are cut by a traversal, they create corresponding angles