回复:如果我告诉大家,上述答案中有且仅有一个是正确的,是哪个呢?:)

Draw a circumcircle of triangle ABC with the circumcenter O. Obvious, O is on the line of the perpendicular bisector of BC, which passes the circumcircle at O'. Connect AO'. Since arc BO'=arc CO', angle BAO'= angle O'AC.

Therefore, the meet point of angle bisector of angle BAC and the perpendicular bisector of BC can't be inside of triangle ABC.

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中文解释 -dayuwang- 给 dayuwang 发送悄悄话 (279 bytes) () 02/02/2009 postreply 20:28:37

呵呵 :) -idiot94- 给 idiot94 发送悄悄话 idiot94 的博客首页 (0 bytes) () 02/05/2009 postreply 11:15:59

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