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如图,已知扇形AOB的半径为12,OA⊥OB,C为OB上一点,以OA为直径的半圆...
如图,已知扇形AOB的半径为12,OA⊥OB,C为OB上一点,以OA为直径的半圆O
1;和以BC为直径的半圆O
2相切于点D,则图中阴影部分的面积是( )
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A.6π
B.10π
C.12π
D.20π
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