已知角aob=120度,oc为角aob内的任意一条射线,od,oe分别是角aoc

已知角aob=120度,oc为角aob内的任意一条射线,od,oe分别是角aoc
已知角aob=120度,oc为角aob内的任意一条射线,od,oe分别是角aoc

已知角aob=120度,oc为角aob内的任意一条射线,od,oe分别是角aoc
∵ OD平分∠AOC,OE平分∠BOC ∴ ∠AOD = ∠DOC ,∠COE = ∠EOB∠AOB = 120° = ∠AOD + ∠DOC + ∠COE + ∠EOB = 2*∠DOC + 2*∠COE = 2*∠DOE∴∠DOE = 120° / 2 = 60°