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TR-MO-R1 2016 Problem 13

    Bir ABCABC üçgeninin BCBC kenarına ait dış teğet çemberinin merkezi OO olsun. OO dan geçen bir doğru ABAB ve ACAC doğrularını sırasıyla DD ve EE de kesiyor. ∣AD∣>∣AB∣|AD| > |AB|, ∣AE∣>∣AC∣|AE| > |AC|, ∣AD∣=∣AE∣|AD| = |AE|, ∣BD∣=9|BD| = 9, ∣OD∣=8|OD| = 8, ∣OC∣=4|OC| = 4 ise ∣OB∣|OB| kaçtır?

    a) 44 b) 92\dfrac{9}{2} c) 55 d) 112\dfrac{11}{2} e) 66

    Official text Turkish Mathematical Olympiad, first round 2016 official paper, page 6. Quoted with source.

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