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TR-MO-R1 2014 Problem 5

    DD, ∣AB∣=∣AC∣|AB| = |AC| olan bir ABCABC ikizkenar üçgeninin [BC][BC] kenarı üstünde ∣BD∣=6|BD| = 6 ve ∣DC∣=10|DC| = 10 koşullarını sağlayan bir nokta olmak üzere, ABDABD ve ADCADC üçgenlerinin iç teğet çemberlerinin [AD][AD] kenarına değme noktaları sırasıyla, EE ve FF ise, ∣EF∣|EF| nedir?

    a) 12\dfrac{1}{\sqrt{2}} b) 23\dfrac{2}{\sqrt{3}} c) 11 d) 98\dfrac{9}{8} e) 22

    Official text Turkish Mathematical Olympiad, first round 2014 official paper, page 3. Quoted with source.

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