Bài 5
a, \(BC=BH+HC=13\left(cm\right)\)
Áp dụng HTL: \(\left\{{}\begin{matrix}AB=\sqrt{BH\cdot BC}=2\sqrt{13}\left(cm\right)\\AC=\sqrt{CH\cdot BC}=3\sqrt{13}\left(cm\right)\\AH=\sqrt{BH\cdot HC}=6\left(cm\right)\end{matrix}\right.\)
Bài 6:
a: HB=4,5cm
BC=12,5cm
AB=7,5(cm)
AC=10cm