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Torus

Torus

A doughnut shape. Formally, a torus is a surface of revolution obtained by revolving (in three dimensional space) a circle about a line which does not intersect the circle.

 

Yellow torus (donut shape) with radius r (tube) and R (center to tube center). Volume=2π²Rr², Surface Area=4π²Rr.

 

 

See also

Axis of rotation, volume, surface area