Respuesta :

Given:

[tex]\begin{gathered} d=18\text{ in. } \\ r=\frac{d}{2} \\ r=9\text{ in.} \end{gathered}[/tex][tex]\begin{gathered} V=\frac{4}{3}\pi(r)^3 \\ V=\frac{4}{3}\times3\times9\times9\times9 \\ V=2916in^3 \end{gathered}[/tex]