[HÌNH HỌC 9] MỘT SỐ HỆ THỨC VỀ CẠNH VÀ ĐƯỜNG CAO TRONG TAM GIÁC VUÔNG

Một số hệ thức về cạnh và đường cao trong tam giác vuông 

    

$\triangle ABC$ vuông tại A, đường cao $AH$

$\Rightarrow \begin{cases} AB^2 = BH.BC; \; AC^2 = HC.BC \\  AH^2 = HB.HC \\ AB.AC = AH.BC \\ \dfrac{1}{{AH^2 }} = \dfrac{1}{{AB^2 }} + \dfrac{1}{{AC^2 }} \\ BC^2  = AB^2  + AC^2 \end{cases}$

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