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TR-MO-R1 2011 Problem 17

    ABCABC eşkenar üçgeninin iç bölgesindeki bir DD noktası için, ∣AD∣=2|AD| = \sqrt{2}, ∣BD∣=3|BD| = 3 ve ∣CD∣=5|CD| = \sqrt{5} ise, m(ADB^)m(\widehat{ADB}) nedir?

    a) 120∘120^\circ b) 105∘105^\circ c) 100∘100^\circ d) 95∘95^\circ e) 90∘90^\circ

    Official text Turkish Mathematical Olympiad, first round 2011 official paper, page 6. Quoted with source.

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