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.(a) In a building there are 24 cylindrical pillars. The radius of each pillar is 28 cm and heightis 4 m. Find the total cost of painting the curved surface area of all pillars at the rate of 8per metre square. |
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Answer» Radius of cylinderical pillars = r = 28cm =0.28mheight ,h=4mcurved surface area of a cylinder =2πrhcurved surface area of a pillar= 2×22\6×0.28×4=7.04metresq.Curved surface area of 24 such pillars = 7.04×24=168.96metresq.cost of cementing an area of 1metresq. =Rs8so,cost of painting 1689.6metresq.=168.96×8=Rs1,351.68 THANKS |
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