Question
In a triangle △ ABC, AB = AC and ∠A = 80°, then
find ∠B.Solution
In triangle △ABC, AB = AC, so it's an isosceles triangle.
Given ∠A = 80°, the base angles ∠B and ∠C are equal. Using the angle sum of a triangle:
∠A + ∠B + ∠C = 180°
80° + ∠B + ∠B = 180°
2∠B = 100°
∠B = 50°
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