Question

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

• A. 110°
• B. 65°
• C. 55°
• D. 115°

Answer 1

Answer:

C. 55°

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°