Surface-of-revolution meaning

A surface generated by revolving a plane curve about an axis in its plane.
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(mathematics) A surface formed when a given curve is revolved around a given axis. If the resulting surface is a closed one, it also defines a solid of revolution.

A sphere is a surface of revolution of a circle around an axis which runs through the center of the circle.

A torus is a surface of revolution of a circle around an axis which is outside the circle.

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