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TR-MO-R1 2020 Problem 13

    Bir ABCABC üçgeninin sırasıyla [AB][AB] ve [AC][AC] kenarları üzerinde alınan KK ve LL noktaları için ∣AK∣=12|AK| = 12, ∣BK∣=16|BK| = 16 ve ∣CL∣=6|CL| = 6'dır. [BC][BC] kenarı üzerinde DD ve EE noktaları E∈[DC]E \in [DC] ve ∣BD∣=∣DE∣=∣EC∣|BD| = |DE| = |EC| olacak şekilde alınıyor. m(BKE^)=m(CLD^)m(\widehat{BKE}) = m(\widehat{CLD}) ise, ∣AL∣|AL| kaçtır?

    a) 10 b) 11 c) 12 d) 13 e) 14

    Official text Turkish Mathematical Olympiad, first round 2020 official paper, page 8. Quoted with source.

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