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TR-MO-R1 2022 Problem 13

    Dışbükey bir ABCDABCD dörtgeninde köşegenler EE noktasında kesişmektedir. ∣AD∣=6|AD| = 6, ∣AE∣=32|AE| = 3\sqrt{2}, ∣ED∣=3|ED| = 3, m(DAC^)=m(BAC^)m(\widehat{DAC}) = m(\widehat{BAC}) ve m(ACD^)=m(ADB^)m(\widehat{ACD}) = m(\widehat{ADB}) ise, ∣BC∣|BC| nedir?

    a) 262\sqrt{6} b) 55 c) 333\sqrt{3} d) 272\sqrt{7} e) Hiçbiri

    Official text Turkish Mathematical Olympiad, first round 2022 official paper, page 9. Quoted with source.

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