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Isosceles triangle with the vertex angle given: a base angle

The same question, asked 2 times: 11 Sep 2024 S2*, 11 Sep 2024 S3. Every wording below, oldest first.

Try each one first, then open its answer.

  1. Question 1

    11 Sep 2024 S2

    52
    In a triangle ΔABC\Delta ABC, AB = AC and ∠A=80∘\angle A = 80^\circ, then find ∠B\angle B.

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  2. Question 2

    11 Sep 2024 S3

    70
    In a ΔLMN\Delta LMN, ∠L=118∘\angle L = 118^\circ and LM = LN. Find ∠N\angle N.

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