A parallelogram is a quadrilateral with two sets of parallel sides. The opposite sides of a parallelogram are of equal length, and the opposite angles of a parallelogram are congruent. The three-dimensional counterpart of a parallelogram is a parallelepiped.


  • Two parallel sides are of equal length.
  • Area, A, of a parallelogram is A = BH, where B is the base of the parallelogram and H is its height.
  • Area of a parallelogram is twice the area of a triangle created by one of its diagonals.
  • Diagonals of a parallelogram bisect each other.
  • Parallelogram is a special case of the trapezoid.
  • Rectangle is a special case of the parallelogram.
  • Rhombus is a special case of the parallelogram.

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