Find the ratio 64/12; it is 5 1/3, or 5.33 (repeating decimal).
(l1 + l2)
The area of the smaller trap is A = ------------ * h 2
l1 + 12
which becomes A = ----------------- * h which in turn equals 131 m^2.
2
5.33*l1 + 5.33(12)
The area of the larger trap is A = ----------------------------- * 5.33*h 2
This is equivalent to 5.33(l1+12) * 5.33h
--------------------------, which is (5.33)^2 times 1.31 m^2,
2
so our final answer (area of the larger trap) is (5.33)^2*131 m^2, or
3726.2 m^2.