As follows:
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maths~
2009-10-30 2:00 am
回答 (1)
2009-10-30 2:17 am
✔ 最佳答案
In △CAG : AG/BF = GC/FC
12/4 = (GF+3)/3
GF = 6
In △BED :
ED/FC = EB/FB
6/3 = (EF+4)/4
EF = 4
AB : BC = GF : FC = 6 : 3 = 2 : 1
BC : CD = BF : FE = 4 : 4 = 1 : 1
So AB : BC : CD = 2 : 1 : 1
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https://hk.answers.yahoo.com/question/index?qid=20091029000051KK01028