Answer :
6ft
1) Considering the given data, let's visualize it then:
2) Let's calculate it, plugging into the formula
[tex]\begin{gathered} S=\frac{(B+b)h}{2} \\ 36=\frac{(8+4)h}{2} \\ 12h=72 \\ h=6 \end{gathered}[/tex]So the height of the trapezoid is 6 ft
