如图,已知AE⊥BC于E,DF⊥BC于F,AE=DF,AB=DC,AC与BD,AC与BD有怎样的关系?你能进行证明吗?..

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如图,已知AE⊥BC于E,DF⊥BC于F,AE=DF,AB=DC,AC与BD,AC与BD有怎样的关系?你能进行证明吗?..
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如图,已知AE⊥BC于E,DF⊥BC于F,AE=DF,AB=DC,AC与BD,AC与BD有怎样的关系?你能进行证明吗?..
如图,已知AE⊥BC于E,DF⊥BC于F,AE=DF,AB=DC,AC与BD,AC与BD有怎样的关系?你能进行证明吗?
..

如图,已知AE⊥BC于E,DF⊥BC于F,AE=DF,AB=DC,AC与BD,AC与BD有怎样的关系?你能进行证明吗?..
连结AD.
AE、DF都垂直于BC,可见:AE∥DF,又AE=DF,得AEFD是矩形,
所以有:AD∥EF,即:AD∥BC,
而AB=DC,可见:ABCD是等腰梯形,得:AC=BD.

AC与BD相等

图呢?是平面还是?

AC=BD