[SOLVED] trapezoid problem area

this is a tough problem and i just can't seem to solve it. please help, thank you

there is a trapezoid EFZD. top left is E, top right is F, bottom right is Z, and bottom left is D. it is an isosceles trapezoid. the intersection of the diagonals EZ and FD is at point Q. the trapezoid is the lateral face of a frustum and the frustum has base areas of 20 and 32. triangle EQF has an area of 12. find the area of the trapezoid EFZD. we don't know the shape of the bases of the frustum. the bases can be square, triangular, hexagonal, or anything else.