一个平面上的三个圆，每个圆上找一个点。连接三个点构成一个三角形。问：什么时候三角形�长最短？知乎 Sketch Coloring Page

一个平面上的三个圆，每个圆上找一个点。连接三个点构成一个三角形。问：什么时候三角形�长最短？知乎 Template

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84 平面与空间点、直线、面之间的位置关系贵哥讲数学博客园 sketch template

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