Răspuns:
Sper ca ti-a fost de ajutor!
Explicație pas cu pas:
a)DE||BC⇒AD/AB=AE/AC
3/9=6/AC=1/3
AC=6*3=18cm
b)DE||BC⇒AD/BD=AE/CE
AD=16-12=4cm
4/12=5/CE=1/3
CE=5*3=15cm
c)DE||BC⇒AD/BD=AE/EC
BD=36-12=24cm
12/24=AE/6=1/2
AE=6/2=3cm
d)DE||BC⇒AD/AB=AE/AC
AD/12=3/18=1/6
AD=12/6=2cm
