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# 7.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?

Given, r = 7 m and h = 3 m.
Sheet required to make a closed cylinder= Total surface area of the cylinder

$$= 2\pi r(r + h)$$ sq. units

$$=2\times \frac { 22 }{ 7 } \times 7\times (3+7)$$

$$=2\times \frac { 22 }{ 7 } \times 7\times 10$$

$$=440 m^2$$

So, the required metal sheet=$$440m^2$$