The area of a trapezoid can be calculated using the following equation:
[tex]\text{Area = }\frac{height\times(GreaterBase+LowerBase)}{2}[/tex]In this trapezoid, Height = 12m , Greater Base = 17m , Lower Base = 8m. Therefore:
[tex]\text{Area = }\frac{12\times(17+8)}{2}=150m^2[/tex]