a cylindrical pillar is 1m in diameter 4.2m in height . find the cost of washing 6 such pillar in hall at 15perm square
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Diameter= 1m
Radius= 1/2m
Height=4.2m
C.S.A= 2πrh= (2×22/7×1/2×4.2)m^2 = 13.2m^2
Cost of whitewashing 6 such pillars at the rate of ₹15/m^2= ₹(13.2×6×15)= ₹1188
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