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IT-CESENATICO 2024 Problem 4

    Sia ABCDABCD un rettangolo con AB<BCAB < BC, inscritto in una circonferenza Γ\Gamma. Siano PP sull'arco BCBC (non contenente AA) e QQ sull'arco CDCD (non contenente AA) tali che BP=CQBP = CQ.

    La circonferenza di diametro AQAQ interseca nuovamente la retta APAP in SS. La retta per BB e perpendicolare ad AQAQ interseca la retta APAP in XX.

    (a) Dimostrare che XS=PSXS = PS.

    (b) Dimostrare che AX=DQAX = DQ.

    Official text Italian Mathematical Olympiad 2024 official paper, page 1. 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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