Euclid:Proposition/XI/10

Proposition

In the words of Euclid:

If two straight lines meeting one another be parallel to two straight lines meeting one another not in the same plane, they will contain equal angles.

(The Elements: Book $\text{XI}$: Proposition $10$)

Sources

• 1926: Sir Thomas L. Heath: Euclid: The Thirteen Books of The Elements: Volume 3 (2nd ed.) ... (previous) ... (next): Book $\text{XI}$. Propositions