Volume is the space enclosed by 3 dimensional surfaces , that is the space that is normally filled with fluids. A sphere is 3- dimensional circle.The volume of a sphere is given by the formula 4/3 \pi r³, where r is the radius.
Therefore if the radius is 4.5 inches ,
Then the volume = 4/3 × 3.14 × 4.5³
= 381.50999
≈ 381.51 cubic inches