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In a building there are 24 cylindrical pillars. The radius of each pillar is 28 cm and height is 4 m. Find the total cost of painting the curved surface

area of all pillars at the rate of ₹8 per metre square

Radius of cylinderical pillars = r = 28cm =0.28m height ,h=4m curved surface area of a cylinder =2πrh curved 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. =Rs8 so,cost of painting 1689.6metresq.=168.96×8=Rs1,351.68