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如图,△ABC内接于⊙O,OD、OE、OF分别是弦BC、AC、AB的弦心距,则O...
如图,△ABC内接于⊙O,OD、OE、OF分别是弦BC、AC、AB的弦心距,则OD:OE:OF等于( )
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A.sinA:sinB:sinC
B.cosA:cosB:cosC
C.tanA:tanB:tanC
D.
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:
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164706278977744/SYS201310221647062789777009_ST/1.png)
:
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A.
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D.
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如图,⊙O是△ABC的外接圆,已知∠ABO=50°,则∠ACB的大小为( )
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A.40°
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已知⊙O
1与⊙O
2相交,它们的半径分别为3和4,则圆心距O
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