Answer :
Volume of a cylinder is r^2*pi*h
radius is half of the diameter
so: 25^2 * 3.14 * 40
625 * 3.14 * 40 = 78500
78500 mm
radius is half of the diameter
so: 25^2 * 3.14 * 40
625 * 3.14 * 40 = 78500
78500 mm