Definition:Euclid's Definitions - Book I/9 - Rectilineal Angle
Jump to navigation
Jump to search
Definition
In the words of Euclid:
- And when the lines containing the angle are straight, the angle is called rectilineal.
(The Elements: Book $\text{I}$: Definition $9$)
Sources
- 1926: Sir Thomas L. Heath: Euclid: The Thirteen Books of The Elements: Volume 1 (2nd ed.) ... (previous) ... (next): Book $\text{I}$. Definitions