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如图,Rt△ABC中,∠ACB=90°,∠CAB=30°,BC=2,O,H分别为...
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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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