In mathematics, a toroid is a doughnut-shaped object, such as an O-ring. Its annular shape is generated by revolving a geometrical figure around an axis external to that figure. 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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