Raghu needs to make a cylindrical aluminum tube. What will be the area of the

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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 $c m$ respectively [Top and bottom of the tube are of another material]?
( $u s e π = \frac{22}{7}$ )

Options:

A . 2200

m^{2}

B . 220

m^{2}

C . 2200

c m^{2}

D . 220

c m^{2}

Answer: Option C
:
C

Given that,
Radius of the tube = 3.5 $c m$
Length of the tube = 1 m = 100 $c m$
Curved surface area of cylindrical tube
$= 2 π r h$
$= 2 \times \frac{22}{7} \times 3.5 \times 100$
$= 2 \times 22 \times 0.5 \times 100$
$= 2200 c m^{2}$
Hence, the required area of the aluminium sheet is 2200 $c m^{2}$ .

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