Euclid:Proposition/I/5
Jump to navigation
Jump to search
Proposition
In the words of Euclid:
- In isosceles triangles the angles at the base are equal to one another, and, if the equal straight lines be produced further, the angles under the base will be equal to each other.
(The Elements: Book $\text{I}$: Proposition $5$)
Sources
- 1926: Sir Thomas L. Heath: Euclid: The Thirteen Books of The Elements: Volume 1 (2nd ed.) ... (previous) ... (next): Book $\text{I}$. Propositions