(1)假设∠AOC=∠COB=X°
∠EOD=∠DOB=Y°
则∠AOE=∠AOB-∠EOB=2X°-2Y°=120°
得:X°-Y°=60°
∠COD=∠COB-∠DOB=X°-Y°=60°
(2)同上做法,X°-Y°=n°/2
∠COD=∠COB-∠DOB=X°-Y°=n°/2
(1)假设∠AOC=∠COB=X°
∠EOD=∠DOB=Y°
则∠AOE=∠AOB-∠EOB=2X°-2Y°=120°
得:X°-Y°=60°
∠COD=∠COB-∠DOB=X°-Y°=60°
(2)同上做法,X°-Y°=n°/2
∠COD=∠COB-∠DOB=X°-Y°=n°/2