Euclid:Proposition/I/9

Proposition

In the words of Euclid:

To bisect a given rectilineal angle.

(The Elements: Book $\text{I}$: Proposition $9$)

Sources

• 1926: Sir Thomas L. Heath: Euclid: The Thirteen Books of The Elements: Volume 1 (2nd ed.) ... (previous) ... (next): Book $\text{I}$. Propositions