<AOB=150°
Пошаговое объяснение:
<AOB-<AOC=40° ,
<AOB - <BOC = 50°
<AOB-?
AOB+AOC+BOC=360
AOB-AOC=40°. AOC=AOB-40°
AOB - BOC= 50° BOC=AOB-50°
AOB+AOB-40+AOB-50=360
3AOB=360+90=450
<AOB=450÷3=150°
<AOC=150°-40°=110°
<BOC=150°-50°=100°
