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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
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3 cm. 2π
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6 cm. π
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9 cm. 2π
- 2π cm
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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 = | = | cm. | ||
2π | π |