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  1. A right circular cylinder is formed by rolling a rectangular paper 12 cm long and 3 cm wide along its length. The radius of the base of the cylinder will be
    1. 3
      cm.

    2. 6
      cm.
      π

    3. 9
      cm.

    4. 2π cm
Correct Option: B

When a right circular cylinder is formed by rolling a rectangular paper along its length, the circumference of base is equal to length of paper.

∴ 2πr = 12 ⇒ r =
12
=
6
cm.
π



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