Question 1007619
The volume of padding is the volume of the cylinder minus the volume of the sphere...so (remember radius is half the diameter)...
V = (pi)r^2*h - (4/3)(pi)r^3
V = (pi)(3^2)(6) - (4/3)(pi)(3^3)
V = 54(pi) - 36(pi)
V = 18(pi) cubic inches