Question

13. The inner surface of a cylindrical tank must be coated with a corrosion preventive. The tank measures
7 m in diameter and 5 m in height. One litre of corrosion preventive covers an area of 10 m2. How
much material will be needed to coat the tank including the side, top and bottom?​

Answer 1

Answer:

Given:

Radius r=7m, height =3m

We need to find the total surface area of a cylinder

=2πr(r+h)

=2×

7

22

×7(7+3)=440 sq meter

So, 440 sq m sheet of metal is required.