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How to do the math problems in the class [eight times] [math] online and so on! ! ! ! !
Proof: BE = CF, EC * * *,? ∴ ? BE+EC=CF+EC, that is, BC=EF,

You also know that ∠B=∠DEF, ∠ACB=∠F,?

∴ ? △ABD?△DEF(ASA)？ ∴ AB=DE？

Know again? ∠B=∠DEF，？ ∴ab∑de，

∴ ? The quadrilateral ABED is a parallelogram (a set of opposite sides are parallel and equal)?

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