A hollow metal cylinder is open at both ends

MATHEMATICS · Single correct · GCSE · Mathematics · Geometry and Measures · Geometry and Measures

Problem

A hollow metal cylinder is open at both ends. To calculate the amount of metal sheet required to make it, which of the following expressions should be used? (Here rr is the radius and hh is the height.) (a) πr2+2πrh\pi r^{2}+2\pi r h (b) 2πr(h+r)2\pi r(h+r) (c) 2πrh2\pi r h (d) πrh\pi r h

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