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Triunghiul ABC are aria 60 cm ^2si d(A,BC)=8 cm. Aflati lungimea laturii BC

Răspuns :

A ABC=(b*h)/2
h=d(A, BC)=8 cm
BC*h=2*60 cm^2
BC*8 cm=120 cm^2
BC=120 cm^2/8 cm
BC=15 cm