Step 1
State the formula for the area of a trapezoid
[tex]\begin{gathered} The\text{ area of a trapezoid=(}\frac{a+b}{2})\times height(h) \\ \text{Where a= base 1=4}m \\ b=\text{base 2=12m} \\ \text{The area of the trapezoid=40m}^2 \end{gathered}[/tex]Step 2
Find the height
[tex]\begin{gathered} 40=(\frac{4+12}{2})\times h \\ 40=\frac{16}{2}\times h \\ 80=16h \\ h=\frac{80}{16} \\ h=5m \end{gathered}[/tex]Hence, the height = 5m
