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Question

In a building there are 48 cylindrical pillars.The radius of each pillar is 28cm and height is 4m.Find the total cost of pointing the curved surface area of all pillars at the rate of Rs.8 per m2

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Solution

r=28cm=0.28mh=4m

curved surface area of a cylindrical pillars is given as;

CSA=2πrh
=2.227.0.28.4
=7.04m2

cost of painting the CSA of each pillar=8×7.04=Rs56.32

therefore total cost of painting 48 pillars=48×56.32=Rs2703.36

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