Multiple choice

The inner diameter of a circular well is $3.5m$. It is $10m$ deep and area of the playground is $1584{m}^{2}$ Find the cost of plastering this curved surface at the rate of Rs.$40$ per ${m}^{2}$.

  1. Rs.$4400$
  2. Rs.$3400$
  3. Rs.$2400$
  4. Rs.$4300$
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A Correct answer
Explanation

The curved surface area of a cylinder is 2 * pi * r * h. With diameter 3.5m, radius is 1.75m. Area = 2 * (22/7) * 1.75 * 10 = 110 m^2. Cost = 110 * 40 = 4400.

AI explanation

Using the inner curved surface area formula for a cylinder, 2 times pi times r times h, with a radius of 1.75 m and a height of 10 m gives an area of 110 m squared. The cost of plastering this curved surface at Rs. 40 per m squared is calculated by multiplying 110 by 40. The total cost is Rs. 4400.

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