By Poonam

Verified by Ajay Kumar

The ratio of the curved surface area of a cylinder to its total surface area is 7:10. If the volume of the cylinder is 12672 cm³, find its curved surface area.

  1. 2080 cm²

  2. 2348 cm²

  3. 2112 cm²

  4. 2648 cm²

Answer: C

Solution

CSA/TSA=h/(h+r)=7/10, so h=7r/3. Using πr²h=12672 and π=22/7 gives r=12 cm and h=28 cm. CSA=2πrh=2×22/7×12×28=2112 cm².

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