Transversal line

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Transversal t intersects two parallel lines, a and b.
Transversal t intersects two parallel lines, a and b.

In geometry, a transversal line is a line that passes through two or more other coplanar lines at different points, especially when the other coplanar lines are also parallel.

If a is parallel to b, and a transversal t intersects a forming an angle with measure X, then if all three lines are coplanar, t must also form an angle with measure X with b.

[edit] Proofs

Te being 180°.

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