∠АВС=180°-120°=60°
∠ВАС=180°-40°-60°=80°
∠ВАС=180°-80°=100°
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∠АВС=180°-120°=60°
∠ВАС=180°-40°-60°=80°
∠ВАС=180°-80°=100°