In a ∆ABC, ∠A + ∠B = 70° and ∠B + ∠C

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In ∆ ABC,
As we know that , ∠A + ∠B + ∠C = 180°
Given , ∠A + ∠B = 70° and ∠B + ∠C = 130°
∴ ∠A = (∠A + ∠B + ∠C) – (∠B + ∠C)
∠A = 180– 130°= 50°