如图8,直线AB,CD相交于O,OD平分角AOF,OE垂直CD于点O,角1=50度,求角COB,角BOF的度数.
步骤呢?
eo垂直cd,角1=50,boc=doa=40;od平分aof,fod=doa=40,bof=180-40-40=100