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如图,点B在⊙O上,M为直径AC上一点,BM的延长线交⊙O于N,∠BNA=45°...
如图,点B在⊙O上,M为直径AC上一点,BM的延长线交⊙O于N,∠BNA=45°,若⊙O的半径为2
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182632968895457/SYS201310241826329688954009_ST/0.png)
,OA=
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OM,则MN的长为
.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182632968895457/SYS201310241826329688954009_ST/images2.png)
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