Toroid
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File:Toroid by Zureks.svg
A toroid using a square.
A torus is a type of toroid.
In mathematics, a toroid is a surface of revolution with a hole in the middle, like a doughnut. The axis of revolution passes through the hole and so does not intersect the surface.[1] For example when a rectangle is rotated around an axis parallel to one of its edges, then a hollow rectangle-section ring is produced. If the revolved figure is a circle, then the object is called a torus.
The term "toroid" Is also used to describe a toroidal polyhedron. In this context a toroid need not be circular and may have any number of holes.[2]
See also
Notes
- ↑ Weisstein, Eric W., "Toroid", MathWorld.
- ↑ Stewart, B.; "Adventures Among the Toroids:A Study of Orientable Polyhedra with Regular Faces", 2nd Edition, Stewart (1980).
External links
The dictionary definition of toroid at Wiktionary
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