a: \(HB=\dfrac{6^2}{8}=4.5\left(cm\right)\)
BC=HB+HC=12,5cm
\(AB=\sqrt{4.5\cdot12.5}=7.5\left(cm\right)\)
AC=10cm
b: \(HD=\dfrac{HC\cdot HA}{AC}=\dfrac{8\cdot6}{10}=4.8\left(cm\right)\)
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