Question

1.已知∠AOB=100°,OC是∠AOB平分线,OD,OE分别平分∠COB、∠AOC,求∠DOE的度数

Answer 1

1.∠DOE=0.5（∠AOC+∠COD）=50

2.∠DOE=∠EOC+∠DOC=0.5(∠COA+∠COB)=50

3.∠DOE=∠EOC-∠EOC=0.5(∠AOC-∠BOC)=0.5(∠AOB+∠BOC-∠BOC)=50