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TR-MO-R1 2017 Problem 11

    ABCDABCD dışbükey dörtgeninde ABDABD, tepe açısı A^=60+2x\hat{A}=60+2x olan ikizkenar bir üçgendir. s(BA^C)=s(BC^A)=xs\left(B\hat{A}C\right)=s\left(B\hat{C}A\right)=x ise s(DC^A)=?s\left(D\hat{C}A\right)=?

    A) 3030 B) 30+x30+x C) 30−x30-x D) 30−2x30-2x E) 2525

    Official text Turkish Mathematical Olympiad, first round 2017 official paper, page 7. Quoted with source.

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