Paralellogram
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"Parallelogram" or "quadrilateral".
A 2D shape that has four sides and is thirteen letters long is a quadrilateral.
A shape with 4 sides is a quadrilateral
A WRIGGLE.
The geometric answer is a rectangle but that does not have 13 letters. The answer is NOT a quadrilateral nor parallelogram because neither of them need have 4 right angles.