vaaaaaa rogggggg!!!!

Vaaaaaa Rogggggg class=

Răspuns :

7.
ΔAMN ≈ ΔABC
AM/AB=MN/BC=AN/AC
3/4=MN/9=AN/7

a) 3/4=AN/7
4×AN=3×7
4×AN=21   ⇒   AN=21/4=5,25 cm

b) 3/4=MN/9
4×MN=3×9
4×MN=27   ⇒   MN=27/4=6,75 cm