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A cylindrical tube open at both ends is ...

A cylindrical tube open at both ends is made of metal. The internal diameter of the tube is 6 cm and length of the tube ie 10 cm. If the thickness of the metal used is 1 cm, then the outer curved surface area of the tube is:

A

`140` ft square cm

B

`146.5 pi` square cm

C

`70 pi` square cm

D

None of the above

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