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The difference between the outer curved surface area and the inner curved surface area of a hollow cylinder is If its height is cm and the volume of material in it is find its external curved surface area.

A

B

C

D

Answer

Let outer surface area, inner surface area, length
Outer curved surface area of cylinder
Inner curved surface area of cylinder
Difference between two curved surface area cylinder 
.......(1)
Volume of cylinder
.....(2)
Solving,

.....(3)
From (1) and (3),
External curved surface

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