The formula for the volume of a cylinder is: 3.14•r^2•h
Assuming that the height of the cylinder is 8 ft and the radius is 6 ft the volume would be 904.78
Assuming that the height is 6ft and the radius 8ft, the volume would be 1,206.37.
Since you didn't specify as to which was the radius and which was the height, I solved for both scenarios. Hope this helps!