In ∆, if AB=AC and ∠B=700, then find ∠A.
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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°
Explanation:
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