如图,在圆O中,弦CD与直径AB垂直于H点,E是AB延长线上一点,CE交圆O于F点1)求证:BF平分角DFE2)若DF=EF,BE=5,CH=3,求圆O的半径.为什么EF*EC=EB*EA==>EF/EA=EB/EC
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![如图,在圆O中,弦CD与直径AB垂直于H点,E是AB延长线上一点,CE交圆O于F点1)求证:BF平分角DFE2)若DF=EF,BE=5,CH=3,求圆O的半径.为什么EF*EC=EB*EA==>EF/EA=EB/EC](/uploads/image/z/1567025-17-5.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%9C%A8%E5%9C%86O%E4%B8%AD%2C%E5%BC%A6CD%E4%B8%8E%E7%9B%B4%E5%BE%84AB%E5%9E%82%E7%9B%B4%E4%BA%8EH%E7%82%B9%2CE%E6%98%AFAB%E5%BB%B6%E9%95%BF%E7%BA%BF%E4%B8%8A%E4%B8%80%E7%82%B9%2CCE%E4%BA%A4%E5%9C%86O%E4%BA%8EF%E7%82%B91%EF%BC%89%E6%B1%82%E8%AF%81%EF%BC%9ABF%E5%B9%B3%E5%88%86%E8%A7%92DFE2%EF%BC%89%E8%8B%A5DF%3DEF%2CBE%3D5%2CCH%3D3%2C%E6%B1%82%E5%9C%86O%E7%9A%84%E5%8D%8A%E5%BE%84.%E4%B8%BA%E4%BB%80%E4%B9%88EF%2AEC%3DEB%2AEA%3D%3D%26gt%3BEF%2FEA%3DEB%2FEC)
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