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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...
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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