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original poster: 转化与化归

[几何] 一个向量题2

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游客 posted 2017-11-9 10:22
未命名.PNG

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走走看看 posted 2017-11-9 11:40
回复 21# 游客

怎么想到的呢?简直是神来之笔!
强!超强!
谢谢大师!

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isee posted 2017-11-9 12:13
平面几何中的垂足三角形的一个性质(Tesla35 在5#已经证了,只是图形不够直观):

三角形外心与顶点的连线垂直于垂足三角形的三条边
ho-p.png

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