Question

A closed cylindrical tank of radius $7m$ and height $3m$ is made from a sheet of metal. How much sheet of metal is required?

• A. $440m^2$
• B. $540m^2$
• C. $440c{m}^2$
• D. $Noneofthese$

Answer 1

The correct option is A $440m^2$

Total surface area of the cylinder $=2\pi \times r(h+r)$

$=2\times \frac{22}{7}\times 7\times (7+3)=44\times 10=440m^2$

Sheet of metal required $=440m^2$