For this problem use the formula for the volume of an oblique cone which is the same for the usual cone:
[tex]\begin{gathered} V=\text{ }\frac{1}{3}\pi r^2\text{ h =}\frac{1}{3}\pi(XY)^2\text{ WZ} \\ \text{substituting } \\ V=\frac{1}{3}(3.14)\cdot6^2\cdot18=678.24units^3 \end{gathered}[/tex]
