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如图,AB是⊙O的弦,OC是⊙O的半径,OC⊥AB于点D,AB=16cm,OD=...
如图,AB是⊙O的弦,OC是⊙O的半径,OC⊥AB于点D,AB=16cm,OD=6cm,那么⊙O的半径是
cm.
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如图,Rt△ABC中,∠ACB=90°,∠CAB=30°,BC=2,O,H分别为边AB,AC的中点,将△ABC绕点B顺时针旋转120°到△A
1BC
1的位置,则整个旋转过程中线段OH所扫过部分的面积(即阴影部分面积)为( )
A.
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B.
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C.π
D.
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如图,PA切⊙O于点A,PBC是经过O点的割线,若∠P=30°,则弧AB的度数是( )
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A.30°
B.60°
C.90°
D.120°
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小明在打网球时,为使球恰好能过网(网高0.8米),且落在对方区域离网5米的位置上,已知她的击球高度是2.4米,则她应站在离网的( )
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A.7.5米处
B.8米处
C.10米处
D.15米处
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