Definition:Euclid's Definitions - Book XI/14 - Sphere
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Definition
In the words of Euclid:
- When, the diameter of a semicircle remaining fixed, the semicircle is carried round and restored again to the same position from which it began to be moved, the figure so comprehended is a sphere.
(The Elements: Book $\text{XI}$: Definition $14$)
Sources
- 1926: Sir Thomas L. Heath: Euclid: The Thirteen Books of The Elements: Volume 3 (2nd ed.) ... (previous) ... (next): Book $\text{XI}$. Definitions