Question

In a building, there are 24 cylindrical pillars. The radius of each pillar is 28cm and the height is 4m.Find
the total cost of painting the curved surface area of all the pillars at the rate of Rs.8 per.2
.

Answer 1

Answer:

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Explanation:

C.S.A. of cylindrical =2πrh

⇒ C.S.A. of are pillar =2×

7

22

​

×28×4=704cm

2

⇒ C.S.A. of 24 pillars =24×704=16896cm

2

=16896×10

−4

m

2

=1.69m

2

⇒ Total cost Rs. 8×1.69=Rs.13.52