Question

A closed cylindrical tank of radius 7 m and height 3 m is made from a sheet of metal. How much sheet of metal (in square metres) is required?

• A. 44
• B. 444
• C. 440

Answer 1

The correct option is C 440

Given, Radius of cylindrical tank ($r$) = 7 m
Height of cylindrical tank ($h$) = 3 m
Total surface area of cylindrical tank = $2\pi r(h+r)$

$=2\times \frac{22}{7}\times 7(3+7)=44\times 10=440m^2$
Hence, $440m^2$metal sheet is required