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[几何] 以两边为直角边向外作等腰直角三角形,求证$AD \perp B_2C_2$

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abababa posted 2014-12-26 22:34 |Read mode
以$\triangle ABC$的边$AB,AC$为直角边向外作等腰直角三角形$\triangle ABB_1, ACC_1$,$AB_1,AC_1$的中点分别是$B_2,C_2$,$BC_2,CB_2$交点为$D$,求证$AD \perp B_2C_2$
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kuing posted 2014-12-26 23:08

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isee posted 2014-12-26 23:10

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original poster abababa posted 2014-12-29 15:18
谢谢,原来有更一般的情况

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