已知ab.cd为圆o的两条平行弦,MN是AB的垂直平分线,与⊙O交于点M,N求证MN垂直平分CD.OA是圆O的半径,以OA为直径的圆C与圆O的弦AB相交于点D.1.说明线段BD与AD的大小关系2.若点D是圆C的圆周上异于点A
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![已知ab.cd为圆o的两条平行弦,MN是AB的垂直平分线,与⊙O交于点M,N求证MN垂直平分CD.OA是圆O的半径,以OA为直径的圆C与圆O的弦AB相交于点D.1.说明线段BD与AD的大小关系2.若点D是圆C的圆周上异于点A](/uploads/image/z/3212004-12-4.jpg?t=%E5%B7%B2%E7%9F%A5ab.cd%E4%B8%BA%E5%9C%86o%E7%9A%84%E4%B8%A4%E6%9D%A1%E5%B9%B3%E8%A1%8C%E5%BC%A6%2CMN%E6%98%AFAB%E7%9A%84%E5%9E%82%E7%9B%B4%E5%B9%B3%E5%88%86%E7%BA%BF%2C%E4%B8%8E%E2%8A%99O%E4%BA%A4%E4%BA%8E%E7%82%B9M%2CN%E6%B1%82%E8%AF%81MN%E5%9E%82%E7%9B%B4%E5%B9%B3%E5%88%86CD.OA%E6%98%AF%E5%9C%86O%E7%9A%84%E5%8D%8A%E5%BE%84%2C%E4%BB%A5OA%E4%B8%BA%E7%9B%B4%E5%BE%84%E7%9A%84%E5%9C%86C%E4%B8%8E%E5%9C%86O%E7%9A%84%E5%BC%A6AB%E7%9B%B8%E4%BA%A4%E4%BA%8E%E7%82%B9D.1.%E8%AF%B4%E6%98%8E%E7%BA%BF%E6%AE%B5BD%E4%B8%8EAD%E7%9A%84%E5%A4%A7%E5%B0%8F%E5%85%B3%E7%B3%BB2.%E8%8B%A5%E7%82%B9D%E6%98%AF%E5%9C%86C%E7%9A%84%E5%9C%86%E5%91%A8%E4%B8%8A%E5%BC%82%E4%BA%8E%E7%82%B9A)
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