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  4. Associated Concepts (hierarchy name)
  5. scientific concepts
  6. mathematical concepts
  7. geometric concepts
  8. geometric figures
  9. plane figures
  10. polygons
  11. quadrilaterals (polygons)
  12. parallelograms
Scope note
Quadrilateral figures in which both pairs of opposite sides are parallel to each other, especially used for such figures in which the sides do not intersect at right angles. For four-sided figures having right angles, the terms "square" or "rectangle" are more commonly used.
Accepted term: 22-Jul-2024