# Category:Definitions/Parallel

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This category contains definitions related to Parallel.

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 $23$)

### Planes

Two planes are **parallel** if, when produced indefinitely, do not intersect at any place.

In the words of Euclid:

**Parallel planes**are those which do not meet.

## Pages in category "Definitions/Parallel"

The following 4 pages are in this category, out of 4 total.