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TR-MO-R1 2019 Problem 5

    Bir ABCDABCD dikdörtgeninin [AB][AB] kenarı üzerinde m(BDC^)=m(EDA^)m(\widehat{BDC}) = m(\widehat{EDA}) olacak biçimde bir EE noktası alınıyor. [BD][BD] doğru parçasının orta noktası FF olmak üzere, ∣AD∣=6|AD| = 6 ve ∣BE∣=9|BE| = 9 ise, ∣EF∣|EF| kaçtır?

    a) 33 b) 44 c) 323\sqrt{2} d) 262\sqrt{6} e) 252\sqrt{5}

    Official text Turkish Mathematical Olympiad, first round 2019 official paper, page 4. Quoted with source.

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