圆O的弦AD‖BC,过点D的切线交BC的延长线于E,AC‖DE交BD于点H,DO及延长线分别交于AC,BC于点G,F(1)求证:DF垂直平分AC(2)求证FC=CE(3)若弦AD=5,AC=8,求圆O的半径
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![圆O的弦AD‖BC,过点D的切线交BC的延长线于E,AC‖DE交BD于点H,DO及延长线分别交于AC,BC于点G,F(1)求证:DF垂直平分AC(2)求证FC=CE(3)若弦AD=5,AC=8,求圆O的半径](/uploads/image/z/3246950-38-0.jpg?t=%E5%9C%86O%E7%9A%84%E5%BC%A6AD%E2%80%96BC%2C%E8%BF%87%E7%82%B9D%E7%9A%84%E5%88%87%E7%BA%BF%E4%BA%A4BC%E7%9A%84%E5%BB%B6%E9%95%BF%E7%BA%BF%E4%BA%8EE%2CAC%E2%80%96DE%E4%BA%A4BD%E4%BA%8E%E7%82%B9H%2CDO%E5%8F%8A%E5%BB%B6%E9%95%BF%E7%BA%BF%E5%88%86%E5%88%AB%E4%BA%A4%E4%BA%8EAC%2CBC%E4%BA%8E%E7%82%B9G%2CF%EF%BC%881%EF%BC%89%E6%B1%82%E8%AF%81%EF%BC%9ADF%E5%9E%82%E7%9B%B4%E5%B9%B3%E5%88%86AC%EF%BC%882%EF%BC%89%E6%B1%82%E8%AF%81FC%3DCE%EF%BC%883%EF%BC%89%E8%8B%A5%E5%BC%A6AD%3D5%2CAC%3D8%2C%E6%B1%82%E5%9C%86O%E7%9A%84%E5%8D%8A%E5%BE%84)
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