Question:
In a ΔABC, if AB = AC and ∠B = 70°. Find ∠A.
Solution:
Consider a ΔABC, if AB = AC and ∠B = 70°
Since, AB = AC ΔABC is an isosceles triangle
∠B = ∠C [Angles opposite to equal sides are equal]
∠B = ∠C = 70∘
And also,
Sum of angles in a triangle = 180°
∠A + ∠B + ∠C = 180°
∠A + 70° + 70° = 180°
∠A = 180° - 140°
∠A = 40°
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