Răspuns:
1)<AOC=150°
2)2x+50+7x-40+5x=360°
14x+10=360
14x=350
X=350:14=25
<AOB=2X+50=2*25+50=50+50=100°
<BOC=7X-40=7*25-40=175-40=135°
<AOC=360-235=125°
3)360-246=114
X+4+x-16=114
2x-12=114
2x=114-12
2x=102
X=51°<AOF=X-16=51-16=35°
4)360-320=40°
<COD=40°
