The simplest would be a 4-sided parallelogram, including rectangles, squares, and rhombi. Many other shapes would also qualify.
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A square
if you think about what you just wrote you will find something interesting by defining a shape by this definition.
A rhombus.
You are incorrect!!! A SQUARE is a 2-dimensional shape ( tetragon) All four sides are of equal length. The opposite sides are parallel All four angles = 90 degrees. NB There are many other tetragons viz. Rhombus, Rectangle, Parallelogram, Kite, Trapezium, and irrgular quadrilateral.
It could be a trapezoid having 2 right angles, an obtuse angle and an acute angle