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单词 cylinder
释义

cylinder

A cylinder is a surface with a circular base, a circular top of the same size, and the curved surface formed by the vertical line segments joining them. For a cylinder with base of radius r and height h, the cylinder's interior has volume πr2h, and the area of the curved surface equals 2πrh.

A right circular cylinder

More generally, a cylinder is a surface, consisting of the points of the lines, called generators, drawn through the points of a fixed curve and parallel to a fixed line. The generators may be extended indefinitely in both directions. Compare prism.

A cylinder over a curve

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更新时间:2025/4/28 13:22:47