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cylinder |
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cylinderIn geometry, a prism with a circular cross-section. In everyday use, the term applies to a right cylinder, in which the curved surface is perpendicular to the base. As it is a prism, the volume (V) of a cylinder is area of cross-section (πr2) × height (h), or where r is the radius of the base and h is the height of the cylinder. Its total surface area (A) = the curved surface area + the area of both circular ends. To find the curved surface area, the hollow cylinder area should be imagined stretched flat to form a rectangle: Curved surface area = circumference × h, or 2πr × h Area both circular ends = 2 × πr2 So A = 2πr2 + 2πrh and by factorizing:
cylinder
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