1)∠AOC=∠DOC,∠AOE=BOF,∠EOC=DOF
2)∠AOC的邻补角是∠AOD和∠BOC
,∠AOE的邻补角是∠AOF和∠BOE
,∠EOC的邻补角∠DOE和∠AOF
3)∠BOD=∠AOC=40°
,∠BOC=180-∠AOC=140°
1)∠AOC=∠DOC,∠AOE=BOF,∠EOC=DOF
2)∠AOC的邻补角是∠AOD和∠BOC
,∠AOE的邻补角是∠AOF和∠BOE
,∠EOC的邻补角∠DOE和∠AOF
3)∠BOD=∠AOC=40°
,∠BOC=180-∠AOC=140°