a square is not a parallelogram
the dude who said is a retard. squares are parallelograms becuz parallelograms has to hve 2 sets of parallel lines, no more, no less. a square has 2 sets of parallel lines.
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quadrilateral
A parallelogram must have 4 sides and so it must be a quadrilateral. However, the sides of a quadrilateral need not be parallel so a quadrilateral need not be a parallelogram.
It can be a square or a even a parallelogram! It's just something with 4 sides.
A quadrilateral is a polygon with four sides. A parallelogram is a quadrilateral in which the opposite sides are parallel.
In this case, the quadrilateral is sometimes a parallelogram.