题目来源
题目来源1 : 2020年GRE数学新800题
正确率：31%
难度：5
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In the above two concentric circles, the radius of the outside circle is twice as many as that of the inner one. Line segment BC is tangent to the inner circle. What is the central angle corresponding to arc ACB?
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以上解析由 考满分老师提供。
