A cylindrical pillar has a diameter of 70 cm and a height of 6 m. What is the cost of painting its curved surface at Rs. Taking π = 22/7, 25 per square metre?
Correct answer B. Rs. 330
Explanation
Radius = 0.35 m. Curved surface = 2πrh = 2 x 22/7 x 0.35 x 6 = 13.2 sq m. Cost = 13.2 x 25 = Rs. 330.
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