height = 51 yards
Base area = 225 square yards
The volume of the triangular pyramid can be found below
[tex]\begin{gathered} v=\frac{1}{3}Bh \\ \text{where} \\ B=\text{base area} \\ h=\text{height} \\ v=\frac{1}{3}\times225\times51 \\ v=\frac{11475}{3} \\ v=3825yards^3 \end{gathered}[/tex]