如图,∠C=90°,○C与AB相交于点,AC=根号5,CB=2根号5,AD=?图是一个以c为圆心的圆,A在圆上,B在圆外,AB交圆上于D,
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![如图,∠C=90°,○C与AB相交于点,AC=根号5,CB=2根号5,AD=?图是一个以c为圆心的圆,A在圆上,B在圆外,AB交圆上于D,](/uploads/image/z/6882771-3-1.jpg?t=%E5%A6%82%E5%9B%BE%2C%E2%88%A0C%3D90%C2%B0%2C%E2%97%8BC%E4%B8%8EAB%E7%9B%B8%E4%BA%A4%E4%BA%8E%E7%82%B9%2CAC%3D%E6%A0%B9%E5%8F%B75%2CCB%3D2%E6%A0%B9%E5%8F%B75%2CAD%3D%3F%E5%9B%BE%E6%98%AF%E4%B8%80%E4%B8%AA%E4%BB%A5c%E4%B8%BA%E5%9C%86%E5%BF%83%E7%9A%84%E5%9C%86%2CA%E5%9C%A8%E5%9C%86%E4%B8%8A%2CB%E5%9C%A8%E5%9C%86%E5%A4%96%2CAB%E4%BA%A4%E5%9C%86%E4%B8%8A%E4%BA%8ED%2C)
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