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两个圆有几条公切线

更新时间: 2020-09-25 00:00:00     

当两圆半径不相同时:如果两圆外离,则两圆有4条公切线;如果两圆内含,则没有公切线;如果两圆外切,则有3条公切线;如果两圆内切,则有1条公切线;如果两圆相交,则有2条公切线。

当两圆半径相等时:如果两圆外离,则有4条公切线;如果两圆外切,则有3条公切线;如果两圆相交,则有2条公切线;如果两圆重合,则有无数条公切线。

关键词: 公切线

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