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

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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