In the figure above, the radius of circle O is 3, and m∠AOB=60. What is the perimeter of the shaded region?

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问题 In the figure above, the radius of circle O is 3, and m∠AOB=60. What is the perimeter of the shaded region?

选项 A、 
B、 
C、 
D、 
E、 

答案C

解析
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