[Toán 9] Violympic

D

depvazoi

$\Delta ABC$ vuông tại A, đường cao AH
$=> AC^2=HC.BC=9BC$
$=> BC^2-20^2=9BC$
$=> BC=25 (cm)$ (vì BC>0)
$=> BH=16 (cm)$
$=> AH^2=BH.HC=16.9=144$
$=> AH=12 (cm)$
 
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