Triangles ABE and CDE are similar, which allows finding AE/ED and therefore AE and ED.
SAT problem solving practice test 01
10. In the figure above AD = 4, AB = 3 and CD = 9. What is the area of triangle AEC ?
you can go to the site above for an image it would not paste into here and the program wouldnt allow me to add a photo saved from the site
the answer is 4.5 but i cannot for the life of me recall how to do this.