Răspuns:
a) AD=AB-BD=28-16=12 cm
BD/AB =BE/(BE+EC)
notăm BE=x
16/280=x (×+9)
28×=16x+144
12x=144
BE=x=12
b) BD=AB-AD =35-20= 15 cm
BD/AB=BE/(BE+EC)
notămc BE=x
10/16=x (x+18)
16x=10x+180
6x=180
BE=x=30
BC=30+18=48
c) AD=AB-BD=30-25=15 cm
BD/AB=BE/(BE+EC)
notăm EC=x
20/35=8/(x+8)
20x+160=280
20x=120
EC=x=6
BC=8+6=14
d) BD/AB=BE/(BE+EC)
notăm BD=x
x/24=18/12
12x=432
BD=x=36
BC=18+12=30
Sper că te-am ajutat!❤☁️