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In triunghiul DEF dreptunghic in E si EA_|_DF,se dau DF=10 cm si AD=3AE.
Aflati AD,AF si AE


Răspuns :

Din teorema inaltimii obtinem:

[tex] AE^{2}=AD*AF <=> AE^{2}=3*AE*AF<=>AE=3*AF [/tex]

AD=3*AE=3*3*AF=9*AF

AD+AF=DF=10 <=> 9AF+AF=10 <=> 10AF=10 => AF=1 (cm) => AD=9*1=9(cm).

AD=3*AE=> AE=[tex] \frac{AD}{3}= \frac{9}{3}=3(cm). [/tex]