Question

0-1 In triangle ABC, if AB=BC and LB=70° Find LA
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Answer 1

Answer:

Given: In a Δ ABC, AB = AC and ∠B = 70° ∠B = ∠C [Angles opposite to equal sides are equal] Therefore, ∠B = ∠C = 70° Sum of angles in a triangle = 180° ∠A + ∠B + ∠C = 180° ∠A + 70° + 70° = 180° ∠A = 180° – 140° ∠A = 40