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unit of measure: the base unit | the supplementary unit | the derived unit

*geometry: the area of a flat figure | the area of a solid | the volume of the solid*

A ** torus ** is a geometric solid which results from rotation of a circle around an axis places in the plane of the circle, but which does not pass through the center of the circle.

where:

r — the radius of a rotated circle;

R — the radius of rotation, distance from the rotation axis to the circle’s center, on the rotation plane.

*For separation of number integers and decimals, use the symbol – point [.]*

context information: contemporary and archaic unit of measurement of area