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TR-MO-R1 2016 Problem 5

    Bir ABCABC üçgeninde m(BAC^)=45∘m(\widehat{BAC}) = 45^\circ ve [AC][AC] üzerinde alınan bir DD noktası için m(DBC^)=90∘m(\widehat{DBC}) = 90^\circ dir. ∣CD∣∣AB∣=22\dfrac{|CD|}{|AB|} = 2\sqrt{2} ise m(BDC^)m(\widehat{BDC}) nedir?

    a) 52.5∘52.5^\circ b) 60∘60^\circ c) 67.5∘67.5^\circ d) 75∘75^\circ e) 90∘90^\circ

    Official text Turkish Mathematical Olympiad, first round 2016 official paper, page 4. Quoted with source.

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