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TR-MO-R1 2014 Problem 13

    m(ADB^)=15∘m(\widehat{ADB}) = 15^\circ ve m(BCD^)=90∘m(\widehat{BCD}) = 90^\circ olan dışbükey bir ABCDABCD dörtgeninin köşegenleri EE noktasında dik olarak kesişiyor. PP, [AE][AE] üstünde bir nokta olmak üzere, ∣EC∣=4|EC| = 4, ∣EA∣=8|EA| = 8 ve ∣EP∣=2|EP| = 2 ise, m(PBD^)m(\widehat{PBD}) nedir?

    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 2014 official paper, page 5. Quoted with source.

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