Question

OC OD OE 是∠AOB内的射线 OD平分∠AOB,OC平分∠BOD,∠DOE=1／3∠AOE,若∠COE=45°,

Answer 1

∵OD平分∠AOB∠AOD=∠DOB∵OC平分∠BOD∴∠DOC=∠COB∴∠BOC+∠COD=∠BOD=2∠COD∵∠DOE=1／3∠AOE∴3∠DOE=∠AOE∴∠AOE+∠DOE=4∠EOD=∠AOD∴∠AOB=4∠BOC=8∠EOD∵∠COE=45°∴∠EOD+COD=45°=3∠EOD∴∠EOD=15...