1) 180-120=60° - ∠B
2) 180-110=70° - ∠C
3) 180-60-70=50°
Ответ: ∠А=50°.
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1) 180-120=60° - ∠B
2) 180-110=70° - ∠C
3) 180-60-70=50°
Ответ: ∠А=50°.