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Math: Angles - Tutorial
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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:
Types of Angles
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