Răspuns:
Explicație pas cu pas:
DE║ BC
↓
Δ ADE ≈ Δ ABC
AD/AB= 6⁽⁶/30⁽⁶= 1/5
AD/AB= DE/BC=AE/AC= 1/5
DE/BC= 1/5
4/BC= 1/5
BC= 4*5
BC= 20 cm
-
AE/AC= 1/5
5/AC= 1/5
AC= 5*5
AC=25 cm
P= AB+BC+AC
P= 30+20+25
P= 75 cm ( B)
