Cylinder | Surfaces, Volume, Shapes | Britannica
https://www.britannica.com/science/cylinder-mathematics
WEBMar 21, 2024 · cylinder, in geometry, surface of revolution that is traced by a straight line (the generatrix) that always moves parallel to itself or some fixed line or direction (the axis ). The path, to be definite, is directed along a curve (the directrix ), along which the line always glides. In a right circular cylinder, the directrix is a circle.
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