Question

In a school buliding there are 10 cylindrical pillars each having radius 25cm and height 3.5m.Find the cost of painting the pillars at the rate of Rs100per square meter.

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Answer 1

r =25cm, h =3.5m=3.5×100=350cm

area of 1 cylindrical pillar=

csa= 2πrh

=(2×22/7×25×350)cm^2

=55000cm^2=550m^2

area of 10 cylindrical pillar=10×550=5500m^2

cost of painting the pillars=5500×100=₹550000

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