已知:如图,四边形ABCD是菱形,过AB的中点E作AC的垂线EF,交AC于点N,交AD于点M,交CD的延长线于点F.(1)求证:AM=DM:(2)若DF=2,求菱形ABCD的周长.急!快!在线等!
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![已知:如图,四边形ABCD是菱形,过AB的中点E作AC的垂线EF,交AC于点N,交AD于点M,交CD的延长线于点F.(1)求证:AM=DM:(2)若DF=2,求菱形ABCD的周长.急!快!在线等!](/uploads/image/z/6131827-19-7.jpg?t=%E5%B7%B2%E7%9F%A5%EF%BC%9A%E5%A6%82%E5%9B%BE%2C%E5%9B%9B%E8%BE%B9%E5%BD%A2ABCD%E6%98%AF%E8%8F%B1%E5%BD%A2%2C%E8%BF%87AB%E7%9A%84%E4%B8%AD%E7%82%B9E%E4%BD%9CAC%E7%9A%84%E5%9E%82%E7%BA%BFEF%2C%E4%BA%A4AC%E4%BA%8E%E7%82%B9N%2C%E4%BA%A4AD%E4%BA%8E%E7%82%B9M%2C%E4%BA%A4CD%E7%9A%84%E5%BB%B6%E9%95%BF%E7%BA%BF%E4%BA%8E%E7%82%B9F%EF%BC%8E%281%29%E6%B1%82%E8%AF%81%EF%BC%9AAM%3DDM%EF%BC%9A%282%29%E8%8B%A5DF%3D2%2C%E6%B1%82%E8%8F%B1%E5%BD%A2ABCD%E7%9A%84%E5%91%A8%E9%95%BF%EF%BC%8E%E6%80%A5%21%E5%BF%AB%21%E5%9C%A8%E7%BA%BF%E7%AD%89%21)
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