Definition:Euclid's Definitions - Book I/17 - Diameter of Circle

Definition

In the words of Euclid:

A diameter of the circle is any straight line drawn through the center and terminated in both directions by the circumference of the circle, and such a straight line also bisects the center.

(The Elements: Book $\text{I}$: Definition $17$)

Sources

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