a) Xét \(\Delta HAB\) và \(\Delta ACB\) có:
\(\widehat{AHB}=\widehat{CAB}=90^0\)
\(\widehat{HAB}=\widehat{ACB}\) cùng phụ với góc HAC
suy ra: \(\Delta HAB~\Delta ACB\)
\(\Rightarrow\)\(\frac{AB}{CB}=\frac{BH}{AB}\)
\(\Rightarrow\)\(AB^2=BH.BC\)
b) CM: \(\Delta HAC~\Delta ABC\)
\(\Rightarrow\)\(\frac{AC}{BC}=\frac{HC}{AC}\)
\(\Rightarrow\)\(AC^2=BC.HC\)