Definitions of Geometric Objects
Concept

Parallel Lines

Two coplanar lines — lines that are on the same plane — that do not intersect are said to be parallel lines. In a diagram, triangular hatch marks are drawn on lines to denote that they are parallel. The symbol is used to algebraically denote that two lines are parallel. In the diagram, lines m and l are parallel.
One pair of parallel lines and one transversal
Exercises