The formula to find the area of a trapezoid is:
[tex]A= \frac{a+b}{2} h[/tex]
Let's plug in the values.
[tex]A= \frac{11+7}{2} *8[/tex]
Our answer would be:
[tex]A=72[/tex]
This means that the area should be 72 cm squared. We could represent this as [tex]72 cm^2[/tex]
Since we have to divide 72 by 2, our answer would be 36. The answer would be A!
Let me know if you have any questions.
Thanks!
-TetraFish
