如图1,在梯形ABCD中,已知AB平行于DC,AD=BC,延长AB到点E,使得BE=DC,连结CE.(2)在上述条件下,如图2,延长AD、EC交于点G.若将AE翻折,点E与点G刚好重合,折痕为AF,且GC:CE=3:5,AE=2倍根号10,求AF的长.

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