cylinder

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cylinder

cylinder in mathematics, surface generated by a line moving parallel to a given fixed line and continually intersecting a given fixed curve called the directrix; each line of the family of lines forming the cylinder is called a ruling, or generator. If the directrix is a conic section (e.g., a circle or a parabola), the cylinder is called a quadric cylinder. The commonest type of cylinder is the right circular cylinder, in which the directrix is a circle and the lines forming the cylinder are all perpendicular to the plane of the circle. The solid bounded by a cylindrical surface and two parallel planes intersecting the surface in closed curves is also called a cylinder. The perpendicular distance between the planes is the altitude of the cylinder. The volume of the cylinder is equal to the product of the altitude and the area of the base (the area enclosed by either closed curve).

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cylinder

The Concise Oxford Dictionary of English Etymology | 1996 | | Â© The Concise Oxford Dictionary of English Etymology 1996, originally published by Oxford University Press 1996. (Hide copyright information) Copyright

cylinder XVI. — L. cylindrus — Gr. kúlindros roller, f. kulindein roll.
So cylindrical XVII. f. modL. cylindricus — Gr. kulindrikós.

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T. F. HOAD. "cylinder." The Concise Oxford Dictionary of English Etymology. 1996. Encyclopedia.com. 9 Jul. 2009 <http://www.encyclopedia.com>.

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World Encyclopedia | 2005 | Â© World Encyclopedia 2005, originally published by Oxford University Press 2005. (Hide copyright information) Copyright

cylinder Solid figure or surface formed by rotating a rectangle using one side as an axis. If the vertical height is h and the radius of the base r, then the volume is πr²h and the curved surface area 2πrh.

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