![]() ![]() A solid torus is a torus plus the volume inside the torus. Real-world objects that approximate a torus of revolution include swim rings, inner tubes and ringette rings.Ī torus should not be confused with a solid torus, which is formed by rotating a disk, rather than a circle, around an axis. If the revolved curve is not a circle, the surface is called a toroid, as in a square toroid. If the axis of revolution passes through the center of the circle, the surface is a degenerate torus, a double-covered sphere. If the axis of revolution passes twice through the circle, the surface is a spindle torus (or self-crossing torus or self-intersecting torus). If the axis of revolution is tangent to the circle, the surface is a horn torus. If the axis of revolution does not touch the circle, the surface has a ring shape and is called a torus of revolution, also known as a ring torus. ![]() A ring torus is sometimes colloquially referred to as a donut or doughnut. The main types of toruses include ring toruses, horn toruses, and spindle toruses. In geometry, a torus ( PL: tori or toruses) is a surface of revolution generated by revolving a circle in three-dimensional space one full revolution about an axis that is coplanar with the circle. A ring torus with aspect ratio 3, the ratio between the diameters of the larger (magenta) circle and the smaller (red) circle. For other uses, see Torus (disambiguation).Ī ring torus with a selection of circles on its surface As the distance from the axis of revolution decreases, the ring torus becomes a horn torus, then a spindle torus, and finally degenerates into a double-covered sphere. This article is about the mathematical surface. ![]()
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