Euclid:Proposition/I/27
Jump to navigation
Jump to search
Proposition
In the words of Euclid:
- If a straight line falling on two straight lines make the alternate angles equal to one another, the straight lines will be parallel to one another.
(The Elements: Book $\text{I}$: Proposition $27$)
Sources
- 1926: Sir Thomas L. Heath: Euclid: The Thirteen Books of The Elements: Volume 1 (2nd ed.) ... (previous) ... (next): Book $\text{I}$. Propositions