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Răspuns :

EF║BC⇒ΔABC este asemenea cu ΔAEF⇒ propotionalitatea laturilor
AE/AB=EF/BC,  AE=2m, AB=AE+EB=2+3=5m, deci AE/AB=2/5=coeficient de
proportionalitate, ⇒ EF/BC=2/5, BC=10m, EF/10=2/5⇒EF=10*2/5=20/5=4m