The volume of a pyramid with base b and height h is given by:
[tex]V=\frac{1}{3}b\cdot h[/tex]
Then, for the pyramid in the picture we have:
[tex]\begin{gathered} b=9\cdot9=81\text{ units}^2 \\ h=10\text{ units} \\ V=\frac{1}{3}\cdot81\cdot10=270\text{ units}^3 \end{gathered}[/tex]
