如图,已知圆O的直径AB垂直于弦CD,垂足为E点,过C点作CG‖AD,交AB的延长线与点G,连CO并延长交AD于点F,且CF垂直AD,证明E是OB的中点
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![如图,已知圆O的直径AB垂直于弦CD,垂足为E点,过C点作CG‖AD,交AB的延长线与点G,连CO并延长交AD于点F,且CF垂直AD,证明E是OB的中点](/uploads/image/z/2503609-25-9.jpg?t=%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%2C%E5%9E%82%E8%B6%B3%E4%B8%BAE%E7%82%B9%2C%E8%BF%87C%E7%82%B9%E4%BD%9CCG%E2%80%96AD%2C%E4%BA%A4AB%E7%9A%84%E5%BB%B6%E9%95%BF%E7%BA%BF%E4%B8%8E%E7%82%B9G%2C%E8%BF%9ECO%E5%B9%B6%E5%BB%B6%E9%95%BF%E4%BA%A4AD%E4%BA%8E%E7%82%B9F%2C%E4%B8%94CF%E5%9E%82%E7%9B%B4AD%2C%E8%AF%81%E6%98%8EE%E6%98%AFOB%E7%9A%84%E4%B8%AD%E7%82%B9)
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