Question

[Huyhuykk]

tam giac abc can tai a .ke Ah vuong goc voi BC (H thuoc BC).Chung minh :

HB=HC

Goc Bah=Goc CAH

Answer 1

[kakabeng]

hinh tu ke nha

vi tam giac bc can tai a nen goc b = goc c

xet am giac abh va tamgaic ach co

goc ahb= goc ahc (=90do)

goc b=gocc(cmt )

ah canh chung

tam giac abh=am giac ach

vayhb= hc(2 canh tuong ung)

Answer 2

[Huyhuykk]

thks ban