A rectangle with all four side lengths equal. It is a regular four-sided polygon. Rotations and translations preserve this definition; its sides need not be parallel to the coordinate axes.
A square frame formed by removing a concentric square hole from a larger square. If outer and inner sides are positive integers with the same integer parity, the border has integer thickness and contains unit tiles.
The unit square here is the Cartesian product in the Euclidean plane, a square of side length one.

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  1. Rectangle
  2. Quadrilateral
  3. Polygon
  4. Euclidean geometry
  5. Geometry and topology
  6. Area of mathematics
  7. Mathematics
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