Question

# A closed cylindrical tank of radius $7m$and height $3m$is made from a sheet of metal how much sheet of metal is required

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Solution

## Total surface area of cylindrical tank $=2\pi r\left(h+r\right)$$=2×\left(22/7\right)×7\left(3+7\right)\phantom{\rule{0ex}{0ex}}=44×10=440$Therefore, $440{m}^{2}$ metal sheet is required.

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