Question

in a building there are 30 cylindrical pillars . the radius of each pillar is 21cm and height is 6m
1) find curved surface area
2)cost of painting curved surface of 30 pillars at rate of Rupees 12 m sq
3) vol of 20 cylinders

Answer 1

Answer:

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 m

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ANSWER

∵r=28cm=0.28m

h=4m

curved surface area of a cylindrical pillars is given as;

CSA=2πrh

=2.

7

22

.0.28.4

=7.04m

2

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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