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TR-MO-R1 2018 Problem 21

    Bir ABCABC üçgeninde BB köşesine ait iç açıortay karşı kenarı DD de, CC ye ait iç açıortay ise karşı kenarı EE de kesiyor. m(AED^)=m(DEC^)m(\widehat{AED}) = m(\widehat{DEC}) olduğuna göre m(EDB^)m(\widehat{EDB}) kaçtır?

    a) 15∘15^\circ b) 30∘30^\circ c) 45∘45^\circ d) 60∘60^\circ e) 75∘75^\circ

    Official text Turkish Mathematical Olympiad, first round 2018 official paper, page 8. Quoted with source.

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