A cylindrical pillar has radius 21 cm and height 4 cm. Find the curved surface area of the pillar and also find the cost of plishing 36 such cylindrical pillars at the rate of rupees 12 per metre square.
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Step-by-step explanation:csa=2*22/7*21*4
2*22*3*4
44*12
528cm.sqare
Therefore for 36 pillars=36*528
=19008cm .sqare
Cost=12*19008=228096
Therefore cost=rupees2,28,096
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