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

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