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vertical angle
NOUN [GEOMETRY.]
1.
one of two opposite and equal angles formed by the intersection of two lines.
Source: Dictionary.com
vertical angle | Define vertical angle at Dictionary.com
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## Intro to vertical angles | Vertical, complementary, and supplementary ...

By using our knowledge of supplementary, adjacent, and vertical angles, we can solve problems involving the intersection of two lines. Including this one!

## Vertical Angles - Math is Fun

www.mathsisfun.com/geometry/vertical-angles.html

Vertical Angles are the angles opposite each other when two lines cross. " Vertical" in this case ... The interesting thing here is that vertical angles are equal:  ...

## Complementary, Supplementary, and Vertical Angles - AlgebraLAB

www.algebralab.org/lessons/lesson.aspx?file=geometry_anglescomplementarysupplementaryvertical.xml

Complementary angles are two angles with a sum of 90º. Supplementary ... Vertical angles are two angles whose sides form two pairs of opposite rays. We can ...

## Vertical Angles definition - Math Open Reference

www.mathopenref.com/anglesvertical.html

As can be seen from the figure above, when two lines intersect, four angles are formed. Each opposite pair are called vertical angles and are always congruent.