如图,已知在梯形ABCD中,AD//BC,点E,F分别在AB,DC上,EF//BC,EF交AC于G,若EB=DF,AE=9,CF=4,

问题描述:

如图,已知在梯形ABCD中,AD//BC,点E,F分别在AB,DC上,EF//BC,EF交AC于G,若EB=DF,AE=9,CF=4,
求BE,CD和GF/AD的值

AD//BC,点E,F分别在AB,DC上,EF//BC,cf:cd=gf:ad
AE:EB=DF:FC,BE^2=AE*CF,若EB=DF,AE=9,CF=4,BE=6=DF
CD=DF+FC=6+4=10
GF/AD=CF:CD=4:10=2:5