Answer: 21.4
Step-by-step explanation:
If you are here from delta math this is the answer
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80° is the correct answer

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Explanation:</h2>
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:
- Side AB measures x cm
- Side DC measures 4 cm
By definition, opposite sides in any parallelogram measure the same, so AB and DC are opposite, therefore:

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Parallelogram: brainly.com/question/12524581
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