a) m(AOC)= 180 grade
m(AOB)=60 grade
m(BOC)= 180-60=120 grade
m(BOE)= 120/2= 60 grade
m(EOC)= 60 grade( congruent cu BOE)
m(EOF)= 60+90= 150 grade
m(DOF)= 180-(60+90)= 180-150= 30 grade
b) m(COD)= 90-30= 60 grade
m(EOC)= 60 grade
m(DOE)= 120 grade
[OC bisectoarea unghiului DOE deoarece il imparte in doua unghiuri de 60 de grade
