17. Find the area of the metal used to make a water tank

Find the total surface area of the closed cylindrical water tank used in a company that is 42 \(m\) in diameter and 12 \(m\) in height. Also, calculate how much metal was actually used if 4\(\%\) of the metal was wasted in making the tank.

 

 

(i) Total surface area of the water tank \(=\)  \(m^2\)

 

(ii) Area of metal used to make the water tank \(=\)  \(m^2\)

 

[Note: Round off your answer to two decimal places.]