Question

Raghu needs to make a cylindrical aluminum tube. What will be the area of the aluminum sheet required to make the tube, if the length and radius of the tube should be 1 $m$ and 3.5 $cm$ respectively [Top and bottom of the tube are of another material]?

($use\pi =\frac{22}{7}$)

• A. 2200 $m^2$
• B. 220 $m^2$
• C. 2200 $c{m}^2$
• D. 220 $c{m}^2$

Answer 1

The correct option is C

2200 $c{m}^2$

Given that,
Radius of the tube = 3.5 $cm$
Length of the tube = 1 m = 100 $cm$

Curved surface area of cylindrical tube
$=2\pi rh$
$=2\times \frac{22}{7}\times 3.5\times 100$
$=2\times 22\times 0.5\times 100$
$=2200c{m}^2$

Hence, the required area of the aluminium sheet is 2200 $c{m}^2$.