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Answer:
28 units.
Explanation
In any parallelogram, the diagonals divide each other into two equal parts.
In parallelogram CDEF, the diagonal CE divides the diagonal DF into two equal parts: DG and GF.
Therefore:
[tex]\begin{gathered} DF=DG\times2 \\ =14\times2 \\ =28\text{ units} \end{gathered}[/tex]The length of DF is 28 units.