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TR-MO-R1 2012 Problem 17

    Bir ABCABC üçgeninin iç bölgesinde yer alan bir DD noktası için, m(BAD^)=20∘m(\widehat{BAD}) = 20^\circ, m(DAC^)=80∘m(\widehat{DAC}) = 80^\circ, m(ACD^)=20∘m(\widehat{ACD}) = 20^\circ ve m(DCB^)=20∘m(\widehat{DCB}) = 20^\circ ise, m(ABD^)m(\widehat{ABD}) nedir?

    a) 5∘5^\circ b) 10∘10^\circ c) 15∘15^\circ d) 20∘20^\circ e) 25∘25^\circ

    Official text Turkish Mathematical Olympiad, first round 2012 official paper, page 6. Quoted with source.

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