回复：你可以证明所有的三角形都是等腰三角形吗？

来源: dayuwang 于 2009-01-31 12:35:06 [] [旧帖] [给我悄悄话] 阅读数 : (108 bytes)

Point O (the cross point of AO and A'O) is either overlap with A' (when AB=BC) or outside of triangle ABC.

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