In triunghiul ABC , se duce MN||BC , M apartine lui AB si N apartine lui AC . Aflati : a) NC daca AM=6 cm , MB=9 cm , AN=4 cm . b) NC daca AM=5 cm , AB=15 cm , AN=3 cm . c) AN daca MB=6 cm , AB=9 cm , NC=4 cm . d) NC daca AB=16 cm , MB=12 cm , AN=3 cm . e) AN , NC daca MB=6 cm , MA=15 cm , AC=35 cm .