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a fost răspuns

Daca triunghiul ABC ~triunghiulDEF, AB=10cm,AC=14cm si DE=5 cm, atunci DF are lungimea egala cu: A.7cm; B.3√3 cm; C.8 cm; D.2√3 cm.

Răspuns :

AB/AC = DE/DF

10/14 = 5/DF

DF = 14·5/10 = 70/10 = 7 cm 

Raspuns : a) 7 cm

[tex]\it \Delta ABC \sim \Delta DE F \Rightarrow \dfrac{AB}{DE} = \dfrac{AC}{DF} \Rightarrow \dfrac{10}{5} = \dfrac{14}{DF} \Rightarrow 2=\dfrac{14}{DF} \Rightarrow DF=7cm[/tex]


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