Ответ:
∠BOC=x
∠AOB=x+40°
x+x+40°=180°
2x=140°
x=70°
x+40°=110°
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Ответ:
∠BOC=x
∠AOB=x+40°
x+x+40°=180°
2x=140°
x=70°
x+40°=110°