The line that contradicts this definition of a parallel line is an intersecting line.
Intersecting lines are the lines which lie in the same or different plane but the distance between them keep on changing and after a certain distance, the lines meet at one point."
The examples of intersecting lines are crossroads. When two straight roads meet at a common point they form intersecting lines.
The point, line, and plane are undefined words in geometry. Parallel lines are explained using one of the undefined terms "line".
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