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TR-MO-R1 2019 Problem 1

    Bir ABCABC üçgeninin [BC][BC] kenarı üzerinde bir DD noktası ve [AD][AD] üzerinde bir EE noktası alınıyor. ∣DE∣=1|DE| = 1, ∣AE∣=2|AE| = 2 ve ∣BD∣=∣CD∣=3|BD| = |CD| = \sqrt{3} ise, m(BAC^)+m(BEC^)m(\widehat{BAC}) + m(\widehat{BEC}) kaçtır?

    a) 90∘90^\circ b) 120∘120^\circ c) 135∘135^\circ d) 150∘150^\circ e) 180∘180^\circ

    Official text Turkish Mathematical Olympiad, first round 2019 official paper, page 2. Quoted with source.

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