There is nothing because if the shape has only four sides and that means two sets that are parallel, the angles will have to be right ones. Unless it's not a polygon that is.
I take it back maybe a parallelogram.
A rhombus has 4 sides of equal length, opposing parallel sides, and no right angles
A rhombus
a parallogram
A square or maybe a rectangle as well would fit the given description
a square or a parallelogram
square
Rectangle
A parallelogram.
Quadrilaterals
Rhombus
rectangles squares
A rhombus has 4 sides of equal length, opposing parallel sides, and no right angles
A rhombus
A rhombus
a parallogram
It is a square or a rectangle
It is a square or a rectangle