已知角AOB=100度,OM平分角AOC,ON平分角BOC.当OC在角AOB内部时,求角MON的度数.

问题描述:

已知角AOB=100度,OM平分角AOC,ON平分角BOC.当OC在角AOB内部时,求角MON的度数.

∠MON
=∠MOC+∠NOC
=1/2∠AOC+1/2∠BOC
=1/2(∠AOC+∠BOC)=
=1/2∠AOB
=50º