In a building, there are 20 cylindrical pillars. The radius of each pillar is 25cm and the height is
3.5m. Find the total cost of painting the curved surface area of the pillars at the rate of Rs 10 per 2
?
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Answer:
CSA of each pillar = 2πrh
= 2×22/7×25×350cm
=. 55,000 cm²
CSA of 20 pillars = 20×55,000
= 11,00,000 cm²
Cost of painting 2cm² = ₹10
Cost of painy 11,00,000 cm² = 11,00,000×10/2
= ₹55,00,000
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