如图,在⊙O中,
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101636668324501/SYS201311031016366683245017_ST/0.png)
,∠A=40°,则∠B=
度.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101636668324501/SYS201311031016366683245017_ST/images1.png)
考点分析:
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如图,在⊙O中,点C是弧AB的中点,∠A=50°,则∠BOC等于
度.
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如图,⊙O的半径为1cm,弦AB、CD的长度分别为
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cm,1cm,则弦AC、BD所夹的锐角α=
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如图,AB为⊙O直径,点C、D在⊙O上,已知∠BOC=70°,AD∥OC,则∠AOD=
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如图,在⊙O中,∠B=37°,则劣弧
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的度数为( )
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A.106°
B.126°
C.74°
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如图,已知:AB为⊙O的弦(非直径),E为AB的中点,EO的延长线与⊙O相交于C,CM∥AB,BO的延长线与⊙O相交于F,与CM相交于D.
①求证:EC⊥CD;
②当EO:OC=1:3,CD=4时,求⊙O的半径.
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