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A square.
A four-sided polygon may be called a tetragon, quadrilateral, or quadrangle.
an irregular tetragon
A rhombus is a tetragon (or quadrilateral, what ever you want to call it) has two sets of parallel lines, all which are the same length. A square fits the above description, therefore, a square is a rhombus. For a two dimentional object to be square, it must fit the descriptions for the rhombus as well as have 4 right angles.
triangle