A soccer ball is an icosahedron with curved faces that is why it can be regarded as spherical. The volume of a sphere is calculated through,
Vs = 4πr^3/3
where Vs is the volume and r is radius. From the given, 8.65 in is the diameter which is 4.325 in in radius.
Vs = 4π(4.325^3)/3 = 338.88 in cubed.
Thus, the volume of the ball is 338. 88 in cubed.