АВС=АСВ=(180-80)/2=50
b1=50-30=20, c2=50-10=40, m3=180-30-10=140
a1+a2=80, m1+m2=360-140=220, a1+m1=160, a2+m2=140
a1=160-(220-m2)=-60+m2, 140-80-a1=m2, 2m2=120, m2=60 градусов
АВС=АСВ=(180-80)/2=50
b1=50-30=20, c2=50-10=40, m3=180-30-10=140
a1+a2=80, m1+m2=360-140=220, a1+m1=160, a2+m2=140
a1=160-(220-m2)=-60+m2, 140-80-a1=m2, 2m2=120, m2=60 градусов