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In triunghiul ABC consideram punctul E apartine lui Ab astfel incat A apartine(EB) si punctul F apartine AC astfel incat A apartine (FC).Daca: a)AE=2cm,AB=8cm,AF=3cm,AC=12cm si BC=16,aflati EF b)AE=5cm,AB=15cm,AF=4cm,AC=12cm si EF=7cm,aflati BC