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TR-MO-R1 2024 Problem 17

    m(BAC^)=100∘m(\widehat{BAC}) = 100^\circ olan bir ABCABC üçgeninde çevrel merkez OO noktası olup, AA noktasının BCBC doğrusuna göre yansıması DD olsun. BD∩OC={S}BD \cap OC = \{S\} ve CD∩OB={R}CD \cap OB = \{R\} ise, m(RAS^)m(\widehat{RAS}) kaçtır?

    a) 30∘30^\circ b) 45∘45^\circ c) 60∘60^\circ d) 75∘75^\circ e) Hiçbiri

    Official text Turkish Mathematical Olympiad, first round 2024 official paper, page 10. Quoted with source.

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