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 is 10 cm. If the thickness of the metal used is 1 cm, then the outer curved surface area of the tube is



[ A ]    140Ï€sq cm
[ B ]    146.5Ï€ sq cm
[ C ]    70Ï€sq cm
[ D ]    None of these right
Answer : Option D
Explanation :

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