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In a building there are 24 cylindrical pillars. The radius ofeach pillar is 28 cm and height is 4 m. Find the total costof painting the curved surface area of all pillars at the rateof Rs 8 per m2. |
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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=7.04m^2Curved surface area of 24 such pillars = 7.04×24=168.96m^2cost of cementing an area of 1m^2. =Rs8so,cost of painting 1689.6m^2.=168.96×8=Rs1,351.68 |
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