对《几何》教材上一道例题的探讨

Probing into an Exercise Example in Geometry Textbook

利用“费尔马点”有关知识对中学《几何》教材上一道利用“对称”求解水管的最短距离的例题进行进 一步探讨。

With the theory of Fermat's Point taking the place of the foregoing one of Symmetry,a further study is made on an exercise example about the shortest distance of pipes in the high school textbook,Geometry.