Euclid:Proposition/XI/2
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Proposition
In the words of Euclid:
- If two straight lines cut one another, they are in one plane, and every triangle is in one plane.
(The Elements: Book $\text{XI}$: Proposition $2$)
Sources
- 1926: Sir Thomas L. Heath: Euclid: The Thirteen Books of The Elements: Volume 3 (2nd ed.) ... (previous) ... (next): Book $\text{XI}$. Propositions