Euclid:Proposition/XI/6
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Proposition
In the words of Euclid:
- If two straight lines be at right angles to the same plane, the straight lines will be parallel.
(The Elements: Book $\text{XI}$: Proposition $6$)
Sources
- 1926: Sir Thomas L. Heath: Euclid: The Thirteen Books of The Elements: Volume 3 (2nd ed.) ... (previous) ... (next): Book $\text{XI}$. Propositions