Rectangles can transform {torus}|, by connecting top and bottom to make a cylinder and left and right to make a circle. Toruses have two circles, one along cylinder and one around cylinder. Toruses can result when closed plane regions revolve around an axis in a plane that does not intersect surface. If closed plane regions are circles, solid rings form, with volume = 2 * pi^2 * p^2 * r^2 and area = 4 * pi^2 * p * r, where p is torus radius and r is circle radius.
Mathematical Sciences>Geometry>Solid
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Date Modified: 2022.0224