在梯形ABCD中,AD平行于BC,E为CD的中点,连接AE并延长AE交BC的延长线于点F.若AD=2,AB=8,当BC为多少时,点B在线段AF的垂直平分线上.
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![在梯形ABCD中,AD平行于BC,E为CD的中点,连接AE并延长AE交BC的延长线于点F.若AD=2,AB=8,当BC为多少时,点B在线段AF的垂直平分线上.](/uploads/image/z/10761142-22-2.jpg?t=%E5%9C%A8%E6%A2%AF%E5%BD%A2ABCD%E4%B8%AD%2CAD%E5%B9%B3%E8%A1%8C%E4%BA%8EBC%2CE%E4%B8%BACD%E7%9A%84%E4%B8%AD%E7%82%B9%2C%E8%BF%9E%E6%8E%A5AE%E5%B9%B6%E5%BB%B6%E9%95%BFAE%E4%BA%A4BC%E7%9A%84%E5%BB%B6%E9%95%BF%E7%BA%BF%E4%BA%8E%E7%82%B9F.%E8%8B%A5AD%3D2%2CAB%3D8%2C%E5%BD%93BC%E4%B8%BA%E5%A4%9A%E5%B0%91%E6%97%B6%2C%E7%82%B9B%E5%9C%A8%E7%BA%BF%E6%AE%B5AF%E7%9A%84%E5%9E%82%E7%9B%B4%E5%B9%B3%E5%88%86%E7%BA%BF%E4%B8%8A.)
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