Definition:Euclid's Definitions - Book XI/21 - Cylinder

From ProofWiki
Jump to navigation Jump to search

Definition

In the words of Euclid:

When, one side of those about the right angle in a rectangular parallelogram remaining fixed, the parallelogram is carried round and restored again to the same position from which it began to be moved, the figure so comprehended is a cylinder.

(The Elements: Book $\text{XI}$: Definition $21$)


Sources