Ta có: CH - BH = 9 => CH = 9 + BH
\(AH^2=BH.CH=BH.\left(9+BH\right)=6^2\)
\(\Rightarrow BH^2+9BH-36=0\Rightarrow\orbr{\begin{cases}BH=3\left(n\right)\\BH=-12\left(l\right)\end{cases}}\)
BH = 3cm => CH = 9 + 3 = 12cm
=> BC = BH + CH = 3 + 12 = 15cm
\(AB^2=BH.BC\Rightarrow AB=\sqrt{BH.BC}=\sqrt{3.15}=3\sqrt{5}cm\)
\(AC^2=CH.BC\Rightarrow AC=\sqrt{CH.BC}=\sqrt{12.15}=6\sqrt{5}cm\)