It can be a square or a even a parallelogram! It's just something with 4 sides.
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quadrilateral
Which shape is not a quadrilateral
i am trying to find out as well
In 2-dimensions, an octagon. In 3-d it could be a heptagonal pyramid, a quadrilateral prism or quadrilateral antiprism. There are probably a few more shapes.
em its a lot of shapes combined together