如图,已知OB、OC是角AOD内部的两条的射线,ON平分角COD,OM平分角AOB,若求角AOD=70°MON=50° BOC=?
问题描述:
如图,已知OB、OC是角AOD内部的两条的射线,ON平分角COD,OM平分角AOB,若求角AOD=70°MON=50° BOC=?
答
AOD-MON=AOM+NOD=70-50=20
ON平分角COD,OM平分角AOB,
BOC=MON-MOB-CNB=MON-AOM-NOD=50-20=30