In a building there are 20 cylindrical pillars. The radius of each pillar is
28cm and the height is 4 m. Find the total cost of painting the curved
surface area of pillars at the rate of Rs.10 per m2.
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Answer:
c s a of cylinder =2πrh
=2*22/7*0.28/4
=2*22*0.01
=44*0.01
=0.44m²
cost of painting per m² is 10 rupees
for 0.44m²=0.44*10=4.4 rupees
for to paint 20 pillars =20*4.4
=88 rupees
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