Question

A cylinderical pillar is 1m in diameter and 4.2m in height.fibd the cost of white washing the curved surface of the pillar at the rate of 15

Answer 1

radius = diameter/2=1/2m
CSA= 2πrh
=2×22/7×1/2×42/10
=13.2m^2

Cost of white washing the CSA of pillar=
15(in ₹)×13.2
=₹198



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Answer 2

Answer: 198

Step-by-step explanation:

h=4.2

d=1

r=1/2=0.5

CSA of pillar=2 {pie}rh

                     =2*22/7*0.5*4.2

                     =2*22*0.5*0.6

                     =44*0.3

                     =13.2

cost of painting=15*13.2

                         =Rs.198

Hope it helps u.