13.
如图,四边形ABCD是⊙O的内接四边形,∠ABC=2∠D,连接OA,OB,OC,AC,OB与AC相交于点E,若∠COB=3∠AOB,OC=2$\sqrt{3}$,则图中阴影部分面积为( )
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| A. | 2$\sqrt{3}$ | B. | 3π-2$\sqrt{3}$ | C. | 3π-4$\sqrt{3}$ | D. | 3π |