### Concept (1)

Vertical angles always come in pairs. They share a common vertex but they cannot share a side. **Vertical angles** are congruent, which means they have equal measures.

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Sample Problems
(3)

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###### Problem 1

How to find the measure of an angle using the Triangle Angle Sum Theorem and vertical angles.

###### Problem 2

How to solve for a variable used to measure vertical angles.

###### Problem 3

How to determine the measure of vertical angles that are supplementary.