toroid
Sign in to savethumb|A toroid using a square. thumb|A torus is a type of toroid.
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- Circular toroid
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thumb|A toroid using a square. thumb|A torus is a type of toroid.
In mathematics, a toroid is a surface of revolution with a hole in the middle. The axis of revolution passes through the hole and so does not intersect the surface. 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.
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mathematics
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circle
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topology
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digital object identifier
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International Standard Serial Number
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doughnut
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rotation
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torus
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solenoid
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helix
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Euler characteristic
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MathWorld
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annulus
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surface of revolution
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Eric W. Weisstein
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genus
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Pappus's centroid theorem
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Toroidal inductors and transformers
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solid torus
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toroidal polyhedron
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