# Category:Definitions/Parallel Lines

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This category contains definitions related to Parallel Lines.

Related results can be found in Category:Parallel Lines.

In the words of Euclid:

**Parallel**straight lines are straight lines which, being in the same plane and being produced indefinitely in either direction, do not meet one another in either direction.

(*The Elements*: Book $\text{I}$: Definition $23$)

The contemporary interpretation of the concept of parallelism declares that a straight line is parallel to itself.

## Pages in category "Definitions/Parallel Lines"

The following 2 pages are in this category, out of 2 total.