The volume of a cylinder is πr²h, so we need to find r. Given the circumference, we know that r is 8 since the circumference is 2πr. This means that 16 is 2r, and r is 8. We can then plug r into the volume equation since we already know the height of the cylinder. We then get 64 × 5 × π. This means the volume of the cylinder is 320pi.
