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TR-MO-R1 2022 Problem 1

    Bir A1A2A3A4A5A6A7A_1A_2A_3A_4A_5A_6A_7 düzgün yedigeninde [A2A6][A_2A_6] doğru parçası üzerinde ∣A6B∣+∣A6A7∣=∣A4A7∣|A_6B| + |A_6A_7| = |A_4A_7| olacak biçimde bir BB noktası alınıyor. m(BA7A6^)m(\widehat{BA_7A_6}) kaç derecedir?

    a) 90∘90^\circ b) 540∘7\dfrac{540^\circ}{7} c) 75∘75^\circ d) 60∘60^\circ e) 360∘7\dfrac{360^\circ}{7}

    Official text Turkish Mathematical Olympiad, first round 2022 official paper, page 3. Quoted with source.

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