In a ΔABC, ∠B + ∠C = 110°, then find the measure of ∠A.

90° 70° 80° 60°

70°

Concept In an triangle ∠A + ∠B + ∠C = 180° Solutions ∠A + 110° = 180° ∠A = 180° - 110° ∠A = 70° Therefore, ∠A = 70°