回复：你可以证明所有的三角形都是等腰三角形吗？

来源: 于 2009-01-31 12:35:06 [旧帖] [给我悄悄话] 本文已被阅读：次

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