twenty cylindrical pillars of a building are to be cleaned if the diameter of each pillar is 0.50m and height is 0.4m what will be the cost of cleaning them at the rate of rs 2.50/m square
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Answer:
rs 314
Step-by-step explanation:
Given 20 cylindrical pillar each of diameter 0.50m and height of 0.4m.
radius= 0.50/2=0.25m
curved surface area of a cylinder is 2πrh
CSA of one pillar = 2* 3.14*0.25m*0.4= 6.28m^2
the cost of cleaning is rs 2.50/m
cost of cleaning one pillar = 6.28* 2.5= rs 15.7
cost of cleaning 20 pillars = 15.7*20= rs 314
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