Between 8 and 10. Because the number graph goes in two's and not in one's, the odd numbers go in between the even numbers.
Since CB || ED and CB = ED,
by the alternate interior angles theorem,
mE = mC, and mD = mB.
with CB = ED, we can conclude that CBF = EDF, by SAS congruent theorem.
I did this manually on some notepaper but my scanner is not working.
The answer is 72 cm^2