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如图,⊙O过点B、C,圆心O在等腰Rt△ABC的内部,∠BAC=90°,OA=1...
如图,⊙O过点B、C,圆心O在等腰Rt△ABC的内部,∠BAC=90°,OA=1,BC=6.则⊙O的半径为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193319282037334/SYS201311011933192820373010_ST/images0.png)
A.6
B.13
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193319282037334/SYS201311011933192820373010_ST/0.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193319282037334/SYS201311011933192820373010_ST/1.png)
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