Question

如图,已知角AOB=165°,角AOC=角BOD=90°,OE平分角AOB.求角COE及角DOE的度数

Answer 1

∠EOB=∠AOB/2=82.5,

∠DOE=∠DOB-∠EOB=90-165/2=7.5

∠EOC=∠EOB-∠COB=82.5-(165-90)=82.5-75=7.5