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TR-MO-R1 2021 Problem 13

    Köşeleri OO merkezli bir ω\omega çemberi üzerinde yer alan bir ABCDABCD karesi veriliyor. [CD][CD] kenarının orta noktasından geçen bir doğru ω\omega çemberinin küçük CDCD yayını KK de, küçük ADAD yayını LL noktasında kesiyor. m(KOL^)=120∘m(\widehat{KOL}) = 120^\circ ise, m(KDC^)m(\widehat{KDC}) kaçtır?

    a) 15∘15^\circ b) 20∘20^\circ c) 22,5∘22,5^\circ d) 25∘25^\circ e) 30∘30^\circ

    Official text Turkish Mathematical Olympiad, first round 2021 official paper, page 8. Quoted with source.

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