题目

如图,在□ABCD中,BC=2AB=4,点E、F分别是BC、AD的中点. (1)求证:△ABF≌△CDF; (2)当四边形AECF为菱形时,求□ABCD的面积. 答案: — Sorry, Tommy. I’ve lost your book.— ______. I’ve got another copy.A.You’re welcome B. That’s all rightC. I hope so D. Of course not
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