Question

A closed cylindrical tank of diameter 14 m and height 5 m is made from a sheet of metal.How much sheet of metal will be required?

Answer 1

In this case we will calculate the Total surface area of the cylindrical tank which will be eaqual to the area of metal sheet required.
TSA = 2*pi*r (h+r)
= 44 (12)
528 m^2
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Answer 2

Here we have closed cylinder, means Total Surface Area (TSA). And the TSA of acylinder is 2pi x r x (r + h), Right? 

According to question,
diameter of the cylindrical tank = 14m
radius will be 14/2 = 7m
height of the cylinderical tank = 5m

Applying the formula,
TSA of Cylindrical Tank = 2pi x r x (r + h)
                                        = 2 x 22/7 x 7 x (7 + 5)
                                        = 528 m^2

So 528m^2 of metal sheet will be required to make the tank.