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

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

c m

respectively [Top and bottom of the tube are of another material]?
(

u s e π = \frac{22}{7}

)

Options:

A . 2200 m2

B . 220 m2

C . 2200 cm2

D . 220 cm2

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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