Question

In a building there are 24 cylindrical pillars . The radius is 28 m of each pillar and height is 4 m . Find the cost of painting the curved surface area of all pillars at the rate of Rs . 8 per square

Answer 1

I think it is helpful for you

Answer 2

As we know that the CSA of a cylinder is 2 × pi × radius × height.
So CSA of 24 cylinders =
2×22/7×28×4×24
= 44×16×24
= 1056×16
= 16896 sq.metre
Now, cost for painting csa =
16896×8
= Rs. 135168