Transversal line
From Biocrawler, the free encyclopedia.
In geometry, a transversal line is a line going through two or more other coplanar lines at different points. Normally, the two lines are not only coplanar, but also parallel.
We know that a is parallel to b, so if a transversal t crosses a with angle θ, then it must also cross b with angle θ. This leads to the relationships shown in the picture; interior angles add up to 180 degrees, exterior angles add up to 180 degrees, and like angles (angles in the same position) are congruent.
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