Multiple choice

In a building there are 30 cylindrical pillars. The radius of each pillar is 35 cm and height is 5 m. Find out the cost of painting the curved surface of half the number of pillars. The rate of painting is Rs. 10 per m2.

  1. Rs. 1650

  2. Rs. 16,500

  3. Rs. 4125

  4. Rs. 8250
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A Correct answer
Explanation

Curved surface area of one pillar = 2 * pi * r * h = 2 * pi * 0.35 * 5 = 3.5 * pi = 11 m^2 (approx). Half pillars = 15. Total area = 15 * 11 = 165 m^2. Cost = 165 * 10 = 1650.

AI explanation

The curved surface area of a cylinder is found using the formula 2*pi*r*h. The radius of 35 cm equals 0.35 m, so the curved surface area of one pillar is 2 * (22/7) * 0.35 * 5 = 11 square meters. For half the pillars, which is 15 pillars, the total area to be painted is 15 * 11 = 165 square meters. At a rate of Rs. 10 per square meter, the total cost is 165 * 10 = Rs. 1650.

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