在圆O中,AB为直径,AC为弦,过点D作CD垂直AB于点D,将三角形ACD绕点A旋转,使点D落在点E处,AE交圆O于点F连接OC、OF(1)求证:CE是圆O的切线(2)若FC//AB,求证:四边形AOCF是菱形图
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![在圆O中,AB为直径,AC为弦,过点D作CD垂直AB于点D,将三角形ACD绕点A旋转,使点D落在点E处,AE交圆O于点F连接OC、OF(1)求证:CE是圆O的切线(2)若FC//AB,求证:四边形AOCF是菱形图](/uploads/image/z/8640768-48-8.jpg?t=%E5%9C%A8%E5%9C%86O%E4%B8%AD%2CAB%E4%B8%BA%E7%9B%B4%E5%BE%84%2CAC%E4%B8%BA%E5%BC%A6%2C%E8%BF%87%E7%82%B9D%E4%BD%9CCD%E5%9E%82%E7%9B%B4AB%E4%BA%8E%E7%82%B9D%2C%E5%B0%86%E4%B8%89%E8%A7%92%E5%BD%A2ACD%E7%BB%95%E7%82%B9A%E6%97%8B%E8%BD%AC%2C%E4%BD%BF%E7%82%B9D%E8%90%BD%E5%9C%A8%E7%82%B9E%E5%A4%84%2CAE%E4%BA%A4%E5%9C%86O%E4%BA%8E%E7%82%B9F%E8%BF%9E%E6%8E%A5OC%E3%80%81OF%EF%BC%881%EF%BC%89%E6%B1%82%E8%AF%81%EF%BC%9ACE%E6%98%AF%E5%9C%86O%E7%9A%84%E5%88%87%E7%BA%BF%EF%BC%882%EF%BC%89%E8%8B%A5FC%2F%2FAB%2C%E6%B1%82%E8%AF%81%EF%BC%9A%E5%9B%9B%E8%BE%B9%E5%BD%A2AOCF%E6%98%AF%E8%8F%B1%E5%BD%A2%E5%9B%BE)
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