Unghi BOC=30grade
OB bisect AOC⇒AOB≡BOC=30 grade fiecare⇒ AOC=30+30=60 GRADE
OC bisect unghi AOD⇒AOC≡COD=60grade fiecare⇒AOC=60+60=120 grade
OD bisect unghi BOE⇒BOD≡DOE
dar BOD=BOC+COD=30+60=90 GRADE
DECI BOD≡BOD=90 GRADE FIECARE
DECI BOE=90+90=180 GRADE
UNGHIUL AOE=360-AOB-BOC-COD-DOE
AOE=360-30-30-60-90=150 GRADE
DACA AOE=150 GRADE UNGHIUL FORMAT DE BISECTOAREA LUI VA FI EGAL CU AOE/2=150:2=75 GRADE