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A closed cylinder tank of radius 7 m and height 3 m is made from a sheet of metal. How many sheets of metal are required.

Class: 9

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420

{cm}^{2}

440

m^{2}

440

{cm}^{2}

143

m^{2}

answer is B.

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Detailed Solution

Required of sheet metals = 2

π

r (h + r)
= 2 ×

\frac{22}{7}

\frac{7}{2} (\frac{7}{2} + 3)

\frac{22 \times 10 \times 4}{2}

= 44 × 10
= 440

m^{2}

Required of sheet metal = 440

m^{2}

So , option (2) is correct.

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