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OMM 2024 Problem 3

    Sea ABCDEFABCDEF un hexágono convexo, y sean A1,B1,C1,D1,E1A_1, B_1, C_1, D_1, E_1 y F1F_1 los puntos medios de AB,BC,CDAB, BC, CD, DE,EFDE, EF y FAFA, respectivamente. Se construyen los puntos A2,B2,C2,D2,E2A_2, B_2, C_2, D_2, E_2 y F2F_2 en el interior de A1B1C1D1E1F1A_1B_1C_1D_1E_1F_1 tales que:

    • El dodecágono A2A1B2B1C2C1D2D1E2E1F2F1A_2A_1B_2B_1C_2C_1D_2D_1E_2E_1F_2F_1 tiene sus 12 lados iguales y
    • ∠A1B2B1+∠C1D2D1+∠E1F2F1=∠B1C2C1+∠D1E2E1+∠F1A2A1=360∘\angle A_1B_2B_1 + \angle C_1D_2D_1 + \angle E_1F_2F_1 = \angle B_1C_2C_1 + \angle D_1E_2E_1 + \angle F_1A_2A_1 = 360^\circ, donde todos los ángulos son menores a 180∘180^\circ,

    prueba que A2B2C2D2E2F2A_2B_2C_2D_2E_2F_2 es cíclico.

    Nota: El dodecágono A2A1B2B1C2C1D2D1E2E1F2F1A_2A_1B_2B_1C_2C_1D_2D_1E_2E_1F_2F_1 tiene forma de estrella de seis picos, donde los picos son A1,B1,C1,D1,E1A_1, B_1, C_1, D_1, E_1 y F1F_1.

    Official text Mexican Mathematical Olympiad 2024 official paper, page 62. Quoted with source.

    A model read this text from the scan of the paper by OCR, with vision/claude@2.1.318 (claude-opus-5-5). No person has checked it against the paper yet.

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