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TR-MO-R1 2011 Problem 21

    Bir ABCDABCD eşkenar dörtgeninin iç bölgesinde yer alan bir EE noktası ∣AE∣=∣EB∣|AE| = |EB|, m(EAB^)=11∘m(\widehat{EAB}) = 11^\circ ve m(EBC^)=71∘m(\widehat{EBC}) = 71^\circ koşullarını sağlıyorsa, m(DCE^)m(\widehat{DCE}) nedir?

    a) 72∘72^\circ b) 71∘71^\circ c) 70∘70^\circ d) 69∘69^\circ e) 68∘68^\circ

    Official text Turkish Mathematical Olympiad, first round 2011 official paper, page 7. Quoted with source.

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