∠AOC=∠BOC+∠AOB=62°+64°=126°.
∠BOD=∠BOC+∠COD=62°+90°=152°.
∠AOD=360°-(∠DOC+∠AOC)=144° ⇒ ∠DOF=∠AOF=1/2∠AOD=72°
∠BOF=∠AOB+∠AOF=72°+64°=136°.
∠EOB=180°-∠BOF=44°.
∠EOC=∠BOC-∠EOB=62°-44°=18°.
∠COF=∠COD+∠DOF=90°+72°=162°.
Răspuns:
a)unghiul AOC= AOB+BOC= 64+62=126 de grade.
b) unghiul BOD=COD+COB= 90+ 62=152 de grade
