Question

如图,∠AOB=x°,∠EOF=y°,OE平分∠AOC,OF平分∠BOC

Answer 1

∠AOB = ∠AOC - ∠BOC = 2∠EOC - 2∠COF = 2∠EOF

x = 2y

y = x/2

∠AOB + ∠EOF = 156°

3∠EOF = 156°

∠EOF = 52°