They are lines that cut through parallel lines
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When two lines are crossed by another line (called the Transversal)
Transversal lines are not parallel and so have a gradient that is different to that of the given lines.
There is no deep meaning to it.
a transversal line If a transversal intersects two parallel lines, then the alternate interior angles are congruent.
When two parallel lines are cut by a transversal, the two pairs of angles on opposite sides of the transversal and outside the parallel lines, and the angles in each pair are congruent.