Răspuns:
<AOB+<BOC+<COD+<DOE+<EOA=360°
x°+20°+x°+15°+2x°-5°+2x°-20°+2x°-10°=360°
8x°=360°/:8
x°=45°
<AOB=45°+20°=65°
<BOC=45°+15°=60°
<AOC=<AOB+<BOC=65°+60°=125°
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