Definition:Euclid's Definitions - Book I/6 - Surface Extremities

Definition

In the words of Euclid:

The extremities of a surface are lines.

(The Elements: Book $\text{I}$: Definition $6$)

Sources

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