1.如图,已知圆O的直径AB垂直于弦CD于点E,过点C作CG平行于AD交AB的延长线于点G,连接CO并延长交AD于点F,且CF⊥AD.(1)试问:CG是圆O的切线吗?说明理由(2)请证明:E是OB的中点(3)若AB=8,求CD的
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![1.如图,已知圆O的直径AB垂直于弦CD于点E,过点C作CG平行于AD交AB的延长线于点G,连接CO并延长交AD于点F,且CF⊥AD.(1)试问:CG是圆O的切线吗?说明理由(2)请证明:E是OB的中点(3)若AB=8,求CD的](/uploads/image/z/7272517-13-7.jpg?t=1.%E5%A6%82%E5%9B%BE%2C%E5%B7%B2%E7%9F%A5%E5%9C%86O%E7%9A%84%E7%9B%B4%E5%BE%84AB%E5%9E%82%E7%9B%B4%E4%BA%8E%E5%BC%A6CD%E4%BA%8E%E7%82%B9E%2C%E8%BF%87%E7%82%B9C%E4%BD%9CCG%E5%B9%B3%E8%A1%8C%E4%BA%8EAD%E4%BA%A4AB%E7%9A%84%E5%BB%B6%E9%95%BF%E7%BA%BF%E4%BA%8E%E7%82%B9G%2C%E8%BF%9E%E6%8E%A5CO%E5%B9%B6%E5%BB%B6%E9%95%BF%E4%BA%A4AD%E4%BA%8E%E7%82%B9F%2C%E4%B8%94CF%E2%8A%A5AD.%EF%BC%881%EF%BC%89%E8%AF%95%E9%97%AE%EF%BC%9ACG%E6%98%AF%E5%9C%86O%E7%9A%84%E5%88%87%E7%BA%BF%E5%90%97%3F%E8%AF%B4%E6%98%8E%E7%90%86%E7%94%B1%EF%BC%882%EF%BC%89%E8%AF%B7%E8%AF%81%E6%98%8E%EF%BC%9AE%E6%98%AFOB%E7%9A%84%E4%B8%AD%E7%82%B9%EF%BC%883%EF%BC%89%E8%8B%A5AB%3D8%2C%E6%B1%82CD%E7%9A%84)
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