In a building there are 24 cylindrical pillars. the radius of each pillar is 28 cm and heights is 4 m . find the total cost of painting the curved surface area of all Pillars at the rate of rupees 8 per meter square ?
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Answer:
Rs 1351.68
Explanation:
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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