Q. 15

# Twenty one cylindrical pillars of the Parliament House are to be cleaned. If the diameter of each pillar is 0.50 m and height is 4 m, what will be the cost of cleaning them at the rate of Rs. 2.50 per square matre?

Answer :

Given,

Number of pillars = 20

Diameter of pillar = 0.50 m

Radius of pillar =

Height of pillar = 4 m

So,

Curved surface area of pillar =

Curved surface area of 20 pillars = 20 ×

∴ Cost of cleaning them at rate Rs.2.50 per m^{2} = Rs.

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