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题目来源1 : GRE数学经典1685题
正确率：70%
难度：4
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Point A and point B are the centers of two circles, and their radius are 10 and 3 respectively. Point C and point D and the points of tangency of the two circles and a horizontal line. Point E and point F are the intersections between the two circles and line AB, EF=12, what is the length of CD?
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· 相关考点
4.5.7 圆与切线
4.5.7 圆与切线
以上解析由 考满分老师提供。
