In triangle ABC, if AB=BC and ∠B = 70°, ∠A will be:

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A110°

B65°

C55°

D115°

Answer:

Given, AB = BC Hence, ∠A=∠C And ∠B = 70° By angle sum property of triangle we know: ∠A+∠B+∠C = 180° 2∠A+∠B=180° 2∠A = 180-∠B = 180-70 = 110° ∠A = 55°

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