The volume of a cylinder is given by the formula πr^2*h, so if the radius in this case is 7 inches (radius = diameter/2 = 14/2 = 7) and the height is 18 inches, then we can substitute these values into the formula above to get:
Volume = π*7^2*18
= 882π
= 2771 in.^3 (to the nearest cubic unit)