A solid torus is a torus plus the volume inside the torus. Ī torus should not be confused with a solid torus, which is formed by rotating a disk, rather than a circle, around an axis. Eyeglass lenses that combine spherical and cylindrical correction are toric lenses. Real-world objects that approximate a torus of revolution include swim rings, inner tubes and ringette rings. 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. 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. In geometry, a torus (plural tori, colloquially donut or doughnut) is a surface of revolution generated by revolving a circle in three-dimensional space about an axis that is coplanar with the circle. ![]() A torus with aspect ratio 3 as the product of a smaller (red) and a bigger (magenta) circle.
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