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[几何] 正三角形

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Shiki Posted 2019-7-11 22:29 |Read mode

过正三角形ABC内任意一点M作三边$AB,BC,CA$的垂线$MC_1，MA_1,MB_1$.
试证明：$AC_1+BA_1+CB_1=C_1B+A_1C+B_1A$

= =

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kuing Posted 2019-7-11 22:34

这个吗？forum.php?mod=viewthread&tid=3810

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Author| Shiki Posted 2019-7-11 22:38

回复 2# kuing

居然五边形还可以做。。。

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