They are 4 sided 2 dimensional shapes
They have 4 interior angles that add up to 360 degrees
They have 4 exterior angles that add up to 360 degrees
They have 2 diagonals
They can be classified as squares, rectangles, rhombuses, parallelograms, kites, trapezoids ... etc
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quadilaterals
any geometric figure which has four sides
There are 2 and they are a square and a rhombus
The properties
The answer will depend on the properties of what!