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CONO-SUR 2025 Problem 5

    Seja ABCD um quadrilátero convexo de lados AB, BC, CD e DA, com AB > BC, que satisfaz:

    ∠ABD=60∘,∠CBD=60∘,∠ACD=30∘.\angle ABD = 60^\circ, \quad \angle CBD = 60^\circ, \quad \angle ACD = 30^\circ.

    Prove que ∠BAC=∠DAC\angle BAC = \angle DAC.

    Official text Cono Sur Mathematical Olympiad 2025 official paper, page 2. Quoted with source.

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