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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

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