如图,已知AB是圆o的直径,过圆o上的点c的切线交AB延长线于E,AD丄Ec于D且交圆o于F.(1)若Ec=4,EB=2,求线段cD和DF的长度(2)求证:AD+DF=AB
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![如图,已知AB是圆o的直径,过圆o上的点c的切线交AB延长线于E,AD丄Ec于D且交圆o于F.(1)若Ec=4,EB=2,求线段cD和DF的长度(2)求证:AD+DF=AB](/uploads/image/z/9595497-57-7.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%B7%B2%E7%9F%A5AB%E6%98%AF%E5%9C%86o%E7%9A%84%E7%9B%B4%E5%BE%84%2C%E8%BF%87%E5%9C%86o%E4%B8%8A%E7%9A%84%E7%82%B9c%E7%9A%84%E5%88%87%E7%BA%BF%E4%BA%A4AB%E5%BB%B6%E9%95%BF%E7%BA%BF%E4%BA%8EE%2CAD%E4%B8%84Ec%E4%BA%8ED%E4%B8%94%E4%BA%A4%E5%9C%86o%E4%BA%8EF.%EF%BC%881%EF%BC%89%E8%8B%A5Ec%3D4%2CEB%3D2%2C%E6%B1%82%E7%BA%BF%E6%AE%B5cD%E5%92%8CDF%E7%9A%84%E9%95%BF%E5%BA%A6%EF%BC%882%EF%BC%89%E6%B1%82%E8%AF%81%EF%BC%9AAD%2BDF%3DAB)
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