This is the square. In case you're wondering about the 4 lines of symmetry, they are a vertical line through the middle, a horizontal line across through the middle, and the two diagonal lines drawn in from corner to corner. Only the square will be symmetrical with any of those 4 lines.
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A regular quadrilateral has 4 lines of symetry
parrallellagram
rectangle
A four-sided quadrilateral having two lines of symmetry is a rectangle
parallelogram