Question

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the radius of the base of a cylindrical pillar of a building is 28 cm and its height is 4.5 metre. rate of painting is rupees 20 per square metre to paint the pillar. find the cost of painting five such pillars​

Answer 1

Given,

Radius of each pillar= 28 cm

Height of each pillar=4 m= 400 cm

So, as we all know

CSA of a cylinder= 2(22/7) rh

= 2 (22/7) (28) (400)

= 70400 sq cm = 7.04 m sq

CSA of one pillar =7.04= (24)

= 168.96 sq m

Since, cost of painting 1 sq m= Rs. 8

∴Cost of 168.96 sq m =Rs. 8 ( 168.96)

                                             = Rs. 1315.68

Answer 2

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