回複：如果我告訴大家，上述答案中有且僅有一個是正確的，是哪個呢？：）

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.

所有跟帖： 

• 中文解釋 -dayuwang- ♂ (279 bytes) () 02/02/2009 postreply 20:28:37

• 嗬嗬 ：） -idiot94- ♂ (0 bytes) () 02/05/2009 postreply 11:15:59