Question

cho tam giac ABC vuong tai A ke duong thang d song song voi BC , BH vuong goc voi d tai H

a) chung minh \(\Delta ABC\) dong dang voi \(\Delta ABH\)

b) ve hinh chieu cua C xuong d tai K , cm : AH.AK=BH.BK minh k nho lam....

c) BH giao AB tai M . Tinh AH va dien tich tam giac MBC neu AB=3 AC=4 BC=5