If one litre of paint covers \(10 \ m^2\), how many litres of paint is required to paint the internal and external surface areas of a cylindrical tunnel whose thickness is \(2 \ m\), internal radius is \(6 \ m\) and height is \(27 \ m\).
Answer:
Curved surface area of the cylindrical tunnel is given by \(sq. \ units\)
Curved surface area of the cylindrical tunnel is \(m^2\).
Quantity of paint required to paint the tunnel \(=\) litres