A B C=490
a) /............../....80/
b)/............./
c) /............/....80....30
490-(80+80+30)=490-190=300 (reprezinta partile egale)
300÷3=100 (reprezinta o parte/un segment)
a=1×100+80=100+80=180
b=1×100=100
c=1×100+80+30=100+80+30=210
Verificare: a+b+c=490
180+100+210=490