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7. A building has 25 cylindrical shaped polesEach has a radius of 28 cm and a height of 4cm. Find the cost of painting curved surfaceof all poles at the rate of 8 per m2 . |
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Answer» Given,Radius of each pillar= 28 cmHeight of each pillar=4 m= 400 cmSo, as we all knowCSA of a cylinder= 2(22/7) rh= 2 (22/7) (28) (400)= 70400 sq cm = 7.04 m sqCSA of one pillar =7.04= (24) = 168.96 sq mSince, cost of painting 1 sq m= Rs. 8∴Cost of 168.96 sq m =Rs. 8 ( 168.96) = Rs. 1315.68 |
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