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[[Image:Ghdyt.png|right|thumb|300px]]
[[Image:Ghdyt.png|right|thumb|300px]]
A '''Torus''' is the mathematical term for a “doughnut” shape created by rotating a circle around an axis.
A '''Torus''' is the mathematical term for a “[[doughnut]]-like” shape created by rotating a circle around an axis.
If the “inner radius” (the size of the doughnut hole) is R, and the radius of the circular cross-section is r, then, the surface area of the torus is
If the “inner radius” (the size of the doughnut hole) is R, and the radius of the circular cross-section is r, then, the surface area of the torus is