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TR-MO-R1 2021 Problem 1

    AB∥CDAB \parallel CD olan bir ABCDABCD yamuğunda ∣CD∣=6|CD| = 6, ∣AC∣=32+6|AC| = 3\sqrt{2} + \sqrt{6} ve ∣BC∣=23+2|BC| = 2\sqrt{3} + 2 eşitlikleri sağlanmaktadır. m(DAC^)=m(DCB^)m(\widehat{DAC}) = m(\widehat{DCB}) ise, ∣AB∣|AB| kaçtır?

    a) 33 b) 5\sqrt{5} c) 3\sqrt{3} d) 6−1\sqrt{6} - 1 e) 22

    Official text Turkish Mathematical Olympiad, first round 2021 official paper, page 2. Quoted with source.

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