Euclid:Proposition/XI/9
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Proposition
In the words of Euclid:
- Straight lines which are parallel to the same straight line and are not in the same plane with it are also parallel to one another.
(The Elements: Book $\text{XI}$: Proposition $9$)
Sources
- 1926: Sir Thomas L. Heath: Euclid: The Thirteen Books of The Elements: Volume 3 (2nd ed.) ... (previous) ... (next): Book $\text{XI}$. Propositions