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# Vertical Angles

## Two congruent, non-adjacent angles formed by intersecting lines.

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Vertical Angles

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### Vocabulary Language: English

TermDefinition
Adjacent Angles Two angles are adjacent if they share a side and vertex. The word 'adjacent' means 'beside' or 'next-to'.
Corresponding Angles Corresponding angles are two angles that are in the same position with respect to the transversal, but on different lines.
Intersecting lines Intersecting lines are lines that cross or meet at some point.
Parallel Two or more lines are parallel when they lie in the same plane and never intersect. These lines will always have the same slope.
Perpendicular lines Perpendicular lines are lines that intersect at a $90^{\circ}$ angle.
Supplementary angles Supplementary angles are two angles whose sum is 180 degrees.
Vertical Angles Vertical angles are a pair of opposite angles created by intersecting lines.
Vertical Angles Theorem The Vertical Angles Theorem states that if two angles are vertical, then they are congruent.