Nothing! Haha just kidding. (I know it's not funny, I am just pathetically bored with my life). Square, trapezoids, rectangles (a square is just a special type of rectangle), a parallelogram (squares and rectangle fit under that catagory). Pretty much any 2D shape that is closed that has 4 sides. with whatever you need it for! :) :) :)
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It is a quadrilateral.
Quadrilateral. (Four sided polygon.)
square
A four-sided quadrilateral is always classified as a polygon.
which type of quadrilateral is never a regular polygon