They are plane (2 dimensional or flat) figures.
They are closed shapes.
They are bounded by four straight sides.
Then there are others that follow from the general attributes of polygons.
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It has 4 sides Its 4 interior angles add up to 360 degrees It can have different shapes.
All quadrilateral shapes have 4 sides
No.
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All quadrilateral shapes are polygons with four sides. The sum of the interior angle of the quadrilateral always add up to three hundred and sixty degrees.