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 is required

Answer 1

Total surface area of cylinder = $2\pi r (r + h)$
$=[2\times\frac{22}{7}\times7(7+3)] m^2$
= 440 m2
Thus, 440 m2 sheet of metal is required.