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TR-MO-R1 2014 Problem 21

    [AB][AB] ve [CD][CD] kenarlarının [BC][BC] kenarına dik olduğu bir ABCDABCD yamuğunun [BC][BC] kenarı üstündeki bir EE noktası için AEDAED bir eşkenar üçgendir. ∣AB∣=7|AB| = 7 ve ∣CD∣=5|CD| = 5 ise, ABCDABCD yamuğunun alanı nedir?

    a) 27327\sqrt{3} b) 4242 c) 24324\sqrt{3} d) 4040 e) 3636

    Official text Turkish Mathematical Olympiad, first round 2014 official paper, page 7. Quoted with source.

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