Question

In a building there are 24 cylindrical pillars.The radius of each is 28cm and height is 4m. Find the total cost of painting the CSA of all pullars at the rate of ₹8 per/m*2

Answer 1

   R= 28CM =0.28m                                                       C.S.A=2πrh=2×22/7×0.28×4
C.S.A of 24 pillars=2×22/7×0.28×4×24
                   
                  =168.96m²
cost of white washing at the rate of 8 ruppees per m²=168.96×8 
                                                                                   =1351.68 ruppees