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Fie triunghiul dreptunghic DEF (m(E)=90°), EM⊥DF, M∈DF. Daca DF = 100 cm si [tex] \frac{DM}{MF}= \frac{9}{16} [/tex], calculati lungimea segmentului [EM].

Răspuns :

DM + MF = 100 cm
[tex]DM=\frac{9MF}{16}[/tex]
[tex]\frac{9MF}{16}+MF=100~cm[/tex]
[tex]\frac{25MF}{16}=100~cm[/tex]
[tex]25MF=1600~cm[/tex]
[tex]MF=64~cm[/tex]
[tex]DM=36~cm[/tex]
[tex]EM=\sqrt{DM\cdotMF}=\sqrt{36\cdot64}=\sqrt{6^2\cdot8^2}=\sqrt{48^2}=48~cm[/tex]