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TR-MO-R1 2019 Problem 9

    Bir ABCABC üçgeninin [AB][AB] kenarı üzerinde bir DD noktası alınıyor. DD noktasından [BC][BC] kenarına inen dikme ayağı EE olmak üzere, ∣AD∣=1|AD| = 1, ∣BE∣=2|BE| = 2, ∣CE∣=4|CE| = 4 ve ∣CD∣=21|CD| = \sqrt{21} ise, ∣AC∣|AC| kaçtır?

    a) 44 b) 55 c) 262\sqrt{6} d) 323\sqrt{2} e) 252\sqrt{5}

    Official text Turkish Mathematical Olympiad, first round 2019 official paper, page 6. Quoted with source.

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