If the main tank at an aquarium is a cylinder getting the volume of the tank we have to follow the equation V = πr^2h. So we basically following the equation we should have V = (3.14)(101.5)2(25). We have to get the full equivalent values for each parameter so this would show as V = (3.14)(10302.25)(25) = 808726.625 or 808727 cubic feet.