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Book I   Proposition 45
Since
    FK is equal and parallel to HG, and HG to ML also,
    KF is also equal and parallel to ML; [C.N.1][I.30]
and
    the straight lines KM, FL join them (at their extremities);
therefore
    KM, FL are also equal and parallel. [I.33]

Therefore    
KFLM is a parallelogram.
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