Răspuns:
b) <(unghiul) AOB=180°=> <COD=180°-(<AOC+<DOB)=><COD=180°-98°=><COD=82°
c) DO bisectoare=><AOC=35•2=70
=><COB=180°-70=110
OE bis=><COE=110/2=55°
e) OF bis=> <EOF=42°
CO bis=><COD=23°
