Question

Are all quadrilaterals parallelograms?

Answer 1

no

Explanation:

It is backwards.

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Answer 2

No, but all parallelograms are quadrilaterals.

Explanation:

Take a trapezoid, for example. A trapezoid is a quadrilateral because it has 4 sides, but it does not contain 2 sets of parallel sides thus making it not a parallelogram.