Transversals
A Transversal is a line that crosses at least two other lines.
The red line is the transversal in each example:
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Transversal crossing two lines
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this Transversal crosses two parallel lines | ... and this one cuts across three lines |
Pairs of Angles
When parallel lines get crossed by a transversal many angles are the same, as in this example:
See Parallel Lines and Pairs of Angles to learn more.