Answer:
Assuming that by length, you mean height, we'll use πr^2h
this gives us πx2x2x3.5
this gives us 14π
when put into your calculator, 14π is 43.98
so we can say 44m^3 when rounded up
now to convert 44m^3 to liters, we know 1 liter is 0.001m^3 so 44m^3 in liters will be 44/0.001.
this gives us 44,000 liters
that is your final answer; 44,000L is the maximum quantity of water that can be stored in the tank.