we know that
The volume of the square pyramid is equal to
[tex]v=\frac{1}{3}\cdot B\cdot h[/tex]where
B is the area of the square base
h is the height of the pyramid
step 1
Find the area of the base B
B=(1.5^2)=2.25 in2
step 2
Find the volume
[tex]\begin{gathered} v=\frac{1}{3}\cdot B\cdot h \\ we\text{ have} \\ B=2.25in^2 \\ h=1.5\text{ in} \\ \text{substitute} \\ V=\frac{1}{3}\cdot(2.25)\cdot(1.5) \\ V=1.125\text{ in\textasciicircum{}3} \end{gathered}[/tex]therefore