Answer
V=972$\pi$ cm$^3$$\approx$3054 cm$^3$
Work Step by Step
r=$\frac{1}{2}$d
r=$\frac{1}{2}$(18)
r=9
V=$\frac{4}{3}$$\pi$r$^3$
V=$\frac{4}{3}$$\pi$(9)$^3$
V=$\frac{4}{3}$$\pi$(729)
V=$\frac{729(4)}{3}$$\pi$
V=$\frac{2916}{3}$$\pi$
V=972$\pi$ cm$^3$$\approx$3054 cm$^3$
