Given the diameter of the sports ball = 15 cm
The ball has the volume of :
[tex]V=\frac{4}{3}\cdot\pi\cdot r^3[/tex]So,
[tex]r=0.5\cdot d=0.5\cdot15=7.5\operatorname{cm}[/tex][tex]V=\frac{4}{3}\cdot\pi\cdot r^3=\frac{4}{3}\cdot3.14\cdot7.5^3=1766.25\operatorname{cm}^3[/tex]