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如图,⊙O过点B、C.圆心O在等腰直角△ABC的内部,∠BAC=90°,OA=1,BC=6,则⊙O的半径为 .
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教案备课库《2017-2018学年湖北省天门市多宝二中实验班九年级(上)期中数学试卷》真题及答案
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