In \( \triangle A B C, D, E \) and \( F \) are the mid-points of the sides \( A B, B C \) and \(...

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In \( \triangle A B C, D, E \) and \( F \) are the mid-points of the sides \( A B, B C \) and \( A C \), respectively. Then, prove that quadrilateral \( D E C F \) is a parallelogram.
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