Răspuns:
Explicație pas cu pas:
AM = 2 cm, MB = 7 cm => AB = 9 cm
AN = 3 cm, AC = 6 cm
din:
[tex]\frac{AM}{AC} = \frac{2}{6} = \frac{1}{3} \\\frac{AN}{AB} = \frac{3}{9} = \frac{1}{3} \\\implies \frac{AM}{AC} = \frac{AN}{AB}[/tex]
=> ΔAMN ~ ΔACB
=> ∠AMN = ∠ACB = 80°
