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CONO-SUR 2025 Problem 1

    Dado um quadrado ABCDABCD, seja PP um ponto no segmento BCBC e seja GG o ponto de interseção de APAP com a diagonal DBDB. A reta perpendicular ao segmento APAP por GG corta o lado CDCD no ponto EE. Seja KK o ponto no segmento GEGE tal que AK=PEAK = PE. Seja QQ o ponto de interseção da diagonal ACAC com o segmento KPKP.

    Demonstre que os pontos E,K,QE, K, Q e CC pertencem a uma mesma circunferência.

    Official text Cono Sur Mathematical Olympiad 2025 official paper, page 1. Quoted with source.

    A model read this text from the scan of the paper by OCR, with vision/local (GLM-OCR-8bit). No person has checked it against the paper yet.

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