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题目来源1 : GRE数学经典1685题
正确率：46%
难度：5
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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)? Give your answer to the nearest tenths.
25.1 显示答案
以上解析由 考满分老师提供。
