Height (h) = 9 yd
Radius = 7 yd
pi = 22/7
[tex]\begin{gathered} \text{ the volume of a cone = }\frac{1}{3}\times\pi\times r^2\times h \\ \end{gathered}[/tex]Substitute the values of r and h in the volume of a cone formular
[tex]V=\text{ }\frac{1}{3}\times\frac{22}{7}\times7\times7\times9[/tex][tex]\begin{gathered} V=\text{ }\frac{22\times7\times7\times9}{3\times7} \\ =\frac{9702}{21} \\ =\text{ 462 cubic yards} \end{gathered}[/tex]