Toroid
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For other uses, see Toroid (disambiguation).
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In mathematics, a toroid is a doughnut-shaped object, such as an O-ring. Its annular shape is generated by revolving a plane geometrical figure about an axis external to that figure which is parallel to the plane of the figure and does not intersect the figure.[1] When a rectangle is rotated around an axis parallel to one of its edges, then a hollow cylinder (resembling a piece of straight pipe) is produced.
If the revolved figure is a circle, then the surface of such an object is known as a torus.
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