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TR-MO-R1 2013 Problem 21

    m(C^)=90∘m(\widehat{C}) = 90^\circ olan bir ABCABC dik üçgeninin [AB][AB] kenarı üstündeki DD ve EE noktaları ∣AD∣=∣AC∣|AD| = |AC| ve ∣BE∣=∣BC∣|BE| = |BC| koşullarını sağlıyor. AECAEC ve BDCBDC üçgenlerinin çevrel çemberlerinin ikinci kez kesiştiği FF noktası için ∣CF∣=2|CF| = 2 ise, ∣ED∣|ED| nedir?

    a) 2\sqrt{2} b) 1+21+\sqrt{2} c) 22 d) 222\sqrt{2} e) Hiçbiri

    Official text Turkish Mathematical Olympiad, first round 2013 official paper, page 7. Quoted with source.

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