Question

[Kotori Minami]

Tam giac ABC (AB < AC)

Tia p/g cua goc A cat duong trung truc BC tai I 

Qua I ke cac duong thang vuong goc voi 2 canh goc A; cat tia AB; Ac tai H; K

C/m: a) AH = AK

b) BH = CK

c) AK = \(\frac{AC+AB}{2}\)

 CK = \(\frac{AC-AB}{2}\)