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This category contains definitions related to Parallel.
Related results can be found in Category:Parallel.


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 $23$)


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.

(The Elements: Book $\text{XI}$: Definition $8$)

Pages in category "Definitions/Parallel"

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