Euclid:Proposition/XI/13
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Proposition
In the words of Euclid:
- From the same point two straight lines cannot be set up at right angles to the same plane on the same side.
(The Elements: Book $\text{XI}$: Proposition $13$)
Sources
- 1926: Sir Thomas L. Heath: Euclid: The Thirteen Books of The Elements: Volume 3 (2nd ed.) ... (previous) ... (next): Book $\text{XI}$. Propositions