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TR-MO-R1 2012 Problem 5

    ∣AB∣=7|AB| = 7, ∣BC∣=12|BC| = 12 ve ∣CA∣=13|CA| = 13 olan bir ABCABC üçgeninin [BC][BC] kenarı üstünde yer alan DD noktası ∣BD∣=5|BD| = 5 koşulunu sağlıyor. r1r_1 ve r2r_2 sırasıyla, ABDABD ve ACDACD üçgenlerinin içteğet çemberlerinin yarıçapları ise, r1/r2r_1/r_2 nedir?

    a) 11 b) 1312\dfrac{13}{12} c) 75\dfrac{7}{5} d) 32\dfrac{3}{2} e) Hiçbiri

    Official text Turkish Mathematical Olympiad, first round 2012 official paper, page 3. Quoted with source.

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