CONO-SUR 2025 Problem 1
Dado um quadrado , seja um ponto no segmento e seja o ponto de interseção de com a diagonal . A reta perpendicular ao segmento por corta o lado no ponto . Seja o ponto no segmento tal que . Seja o ponto de interseção da diagonal com o segmento .
Demonstre que os pontos e pertencem a uma mesma circunferência.
Official text Cono Sur Mathematical Olympiad 2025 official paper, page 1. Quoted with source.
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