EF/AB=28/14=2
ED/AC=ED/40=2; ED=2*40=80
FD/BC=FD/60=2; FD=2*30=60
EF/AB=28/14=2 DЕ/AC=DЕ/40=2; DЕ=2*40=80 DF/BC=DF/60=2; DF=2*30=60
EF/AB=28/14=2
ED/AC=ED/40=2; ED=2*40=80
FD/BC=FD/60=2; FD=2*30=60
EF/AB=28/14=2 DЕ/AC=DЕ/40=2; DЕ=2*40=80 DF/BC=DF/60=2; DF=2*30=60