[tex]\boxed{x=4cm}[/tex]
A parallelogram is a quadrilateral that has two pair of opposite sides and each pair measure the same. In order to illustrate this problem, see the figure below. Here we know some facts:
By definition, opposite sides in any parallelogram measure the same, so AB and DC are opposite, therefore:
[tex]\overline{AB}=\overline{DC} \\ \\ \boxed{x=4cm}[/tex]
Parallelogram: https://brainly.com/question/12524581
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