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A parallelogram is a 4-sided polygon with opposite sides parallel.


It has the following properties:

  • Opposite sides are equal
  • Diagonals bisect each other
  • Opposite angles are equal
  • Adjacent angles sum to 1800
  • It has rotational symmetry of order at least 2.
  • Its area is equal to its base multiplied by its vertical height

The set of rhombuses (rhombi) is a subset of the set parallelograms.