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题目来源1 : GRE数学经典1685题
正确率：86%
难度：2
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The radii of the above two circles are both 3. If these two circles intersect at point P and point Q and each circle pass through the center of the other circle, then what is the total perimeter of the region (not counting the arc inside)?C显示答案
以上解析由 考满分老师提供。
