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TR-MO-R1 2019 Problem 25

    C∈[AB]C \in [AB] olmak üzere, [AB][AB] çaplı bir yarım çember üzerinde DD ve EE noktaları m(ACD^)=m(BCE^)=30∘m(\widehat{ACD}) = m(\widehat{BCE}) = 30^\circ olacak biçimde alınıyor. ∣AC∣=27|AC| = 27 ve ∣CB∣=3|CB| = 3 ise, ∣CD∣−∣CE∣|CD| - |CE| kaçtır?

    a) 1515 b) 1818 c) 2121 d) 10310\sqrt{3} e) 12312\sqrt{3}

    Official text Turkish Mathematical Olympiad, first round 2019 official paper, page 14. Quoted with source.

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