Explicație pas cu pas:
ΔABC ~ ΔADE
[tex]\frac{AB}{AD} = \frac{AC}{AE} = \frac{BC}{DE} < = > \frac{60}{12} = \frac{AC}{10} = \frac{BC}{8} \\ [/tex]
[tex]AC = \frac{60 \times 10}{12} = 50 \: cm \\ [/tex]
[tex]BC = \frac{60 \times 8}{12} = 40 \: cm \\ [/tex]
Perimetrul ΔABC = AB + BC + AC = 60 + 40 + 50 = 150 cm
