hkcee 2003 maths mc 17

For similar traingle, (L1/L2)^2 = (A1/A2)
so AC/AE = 2 / 3
AC/CE = 2 / 1

As CE = EG
so AC = CG
we get AC/AG = 1/2
area of AC / area of AG = 1/4
area of AG = 4*16 = 64

so area of DFGE = 64-20-16 = 28cm^2

2003 MC 17 :
http://www.takwing.idv.hk/studyroom/ce_maths/index.html
會考數學MC詳解 :
http://www.takwing.idv.hk/studyroom/ce_maths/index.html
依個網主按年份逐題逐題解答, 真係好比心機, 你只要按年份再按題號, 便看到MC中文詳解, 希望幫到你la, 加油.
圖片參考：http://hk.yimg.com/i/icon/16/1.gif