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TR-MO-R1 2022 Problem 9

    ∣AB∣=1,∣BC∣=2|AB| = 1, |BC| = 2 ve m(ABC^)=90∘m(\widehat{ABC}) = 90^\circ koşullarını sağlayan bir ABCABC üçgeninde DD noktası, BB noktasının ACAC doğrusuna göre simetriği olsun. [AB][AB] ve [BC][BC] kenarlarına teğet olan ve DD noktasından geçen çemberin yarıçapı kaçtır?

    a) 13\dfrac{1}{3} b) 12\dfrac{1}{2} c) 23\dfrac{2}{3} d) 34\dfrac{3}{4} e) 45\dfrac{4}{5}

    Official text Turkish Mathematical Olympiad, first round 2022 official paper, page 7. Quoted with source.

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