In a building there are 24 cylindrical pillars. The radius of each pillar is 28cm and height is 4m. Find the total cost of painting the curved surface area of all the pillars at the rate of Rs. 8 per m square.
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Radius of cylindrical pillar, r = 28 cm = 0.28 m
height, h = 4 m
curved surface area of a cylinder = 2πrh
curved surface area of a pillar =2 × 22/7 × 0.28 × 4=7.04 m2
curved surface area of 24 such pillar = 7.04 × 24 = 168.96 m2
cost of painting an area of 1 m2 = Rs 8
Therefore, cost of painting 1689.6 m2 = 168.96 × 8 = Rs 1351.68
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height, h = 4 m
curved surface area of a cylinder = 2πrh
curved surface area of a pillar =2 × 22/7 × 0.28 × 4=7.04 m2
curved surface area of 24 such pillar = 7.04 × 24 = 168.96 m2
cost of painting an area of 1 m2 = Rs 8
Therefore, cost of painting 1689.6 m2 = 168.96 × 8 = Rs 1351.68
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curved surface area of pillars = 2πrh
= 2×22/7×28×4= 704 cm²
total cost of painting the curved surface area = 24×704×8= Rs 135168
= 2×22/7×28×4= 704 cm²
total cost of painting the curved surface area = 24×704×8= Rs 135168
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