Back Silinder Afrikaans أسطوانة (هندسة) Arabic Cilindru AST T'uyu Aymara Silindr Azerbaijani سیلندیر AZB Цыліндр Byelorussian Цыліндар BE-X-OLD Цилиндър Bulgarian চোঙ (বেলন) Bengali/Bangla
| Cylinder | |
|---|---|
 A circular right cylinder of height h and diameter d=2r | |
| Type | Smooth surface Algebraic surface |
| Euler char. | 2 |
| Symmetry group | O(2)×O(1) |
| Surface area | 2πr(r + h) |
| Volume | πr2h |
A cylinder (from Ancient Greek κύλινδρος (kúlindros) 'roller, tumbler')[1] has traditionally been a three-dimensional solid, one of the most basic of curvilinear geometric shapes. In elementary geometry, it is considered a prism with a circle as its base.
A cylinder may also be defined as an infinite curvilinear surface in various modern branches of geometry and topology. The shift in the basic meaning—solid versus surface (as in a solid ball versus sphere surface)—has created some ambiguity with terminology. The two concepts may be distinguished by referring to solid cylinders and cylindrical surfaces. In the literature the unadorned term cylinder could refer to either of these or to an even more specialized object, the right circular cylinder.
- ^ κύλινδρος Archived 2013-07-30 at the Wayback Machine, Henry George Liddell, Robert Scott, A Greek-English Lexicon, on Perseus