VOLUME OF PRISM = cross sectional area X length
The cross sectional area is a triangle
First we will find the area of the triangle
Area of triangle = base X height / 2
[tex]\begin{gathered} A=\frac{bh}{2} \\ b=9 \\ h=7 \\ A=\frac{9\times7}{2} \\ A=31.5m^2 \\ V=A\times l \\ l=5m \\ V=31.5\times5 \\ V=157.5m^3 \end{gathered}[/tex]