π 翻过来看是 Maths中的Perp. line?1 ^8 b1 `+ ~- X8 U' e& V% ~4 W& m. Z
And then iaP0)|e>!6o7 =Logical Code! ?; U* q" b) d7 v) B4 F
+ 加上反 V =Angle Bisector? ! x' W+ D9 r2 K/ K& W" {5 pAre they true?# N& V0 G0 O, M4 G& `
Then Are we going to prove somthing?