Question

The volume of a right circular cylinder is 1100 $c{m}^3$ and the radius of its base is 5 cm. The area of its curved surface is

• A. $(440+50\pi )c{m}^2$
• B. $(440+25\pi )c{m}^2$
• C. $440c{m}^2$
• D. None of these

Answer 1

Answer: (C)

Volume of a cylinder$=2\times \pi \times r\times h$

$\Rightarrow 1100=\frac{22}{7}\times 5^2\times h$ {$\because volume=1100c{m}^{3}isgiven$}

$\Rightarrow h=14cm$

$\therefore C.S.A=2\times \frac{22}{7}\times 5\times 14$

$\therefore C.S.A=440c{m}^2$