如图,三角形ABC为等腰三角形,AB=AC,以AB为直径的圆O与BC交于点DDE⊥AB,垂足为E,ED的延长线与AC的延长线交于点F.(1)求证:点D是BC的中点(2).若圆O的半径为2,BE=1,求DE的长第一问是不是用中位线
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![如图,三角形ABC为等腰三角形,AB=AC,以AB为直径的圆O与BC交于点DDE⊥AB,垂足为E,ED的延长线与AC的延长线交于点F.(1)求证:点D是BC的中点(2).若圆O的半径为2,BE=1,求DE的长第一问是不是用中位线](/uploads/image/z/3741445-37-5.jpg?t=%E5%A6%82%E5%9B%BE%2C%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E4%B8%BA%E7%AD%89%E8%85%B0%E4%B8%89%E8%A7%92%E5%BD%A2%2CAB%3DAC%2C%E4%BB%A5AB%E4%B8%BA%E7%9B%B4%E5%BE%84%E7%9A%84%E5%9C%86O%E4%B8%8EBC%E4%BA%A4%E4%BA%8E%E7%82%B9DDE%E2%8A%A5AB%2C%E5%9E%82%E8%B6%B3%E4%B8%BAE%2CED%E7%9A%84%E5%BB%B6%E9%95%BF%E7%BA%BF%E4%B8%8EAC%E7%9A%84%E5%BB%B6%E9%95%BF%E7%BA%BF%E4%BA%A4%E4%BA%8E%E7%82%B9F.%EF%BC%881%EF%BC%89%E6%B1%82%E8%AF%81%EF%BC%9A%E7%82%B9D%E6%98%AFBC%E7%9A%84%E4%B8%AD%E7%82%B9%EF%BC%882%EF%BC%89.%E8%8B%A5%E5%9C%86O%E7%9A%84%E5%8D%8A%E5%BE%84%E4%B8%BA2%2CBE%3D1%2C%E6%B1%82DE%E7%9A%84%E9%95%BF%E7%AC%AC%E4%B8%80%E9%97%AE%E6%98%AF%E4%B8%8D%E6%98%AF%E7%94%A8%E4%B8%AD%E4%BD%8D%E7%BA%BF)
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