Determine volume of the ball with formula of sphere volume
v sphere = 4/3 × π × r³
From the question we know that
d = 8.56 inches
r = 1/2 × d
r = 1/2 × 8.56
r = 4.28
Plug the numbers into the formula
v sphere = 4/3 × π × r³
v sphere = 4/3 × 3.14 × (4.28)³
v sphere = 4/3 × 246.1846
v sphere = 328.25
The volume of the soccer ball is 328.25 in³