The triangle ABE should be based on AE, with a height of 8cm. Otherwise, it will be more difficult to do this problem in grade 5. The solution is as follows: Let the triangle ABE area be X, the trapezoid EBCD area be Y, the trapezoid upper and lower length be Z, and the quadrilateral ABCD area be S. Because S = 8 * 12 = 96 (cm 2), X+Y=96 because Y.