parallelogram
  • noun a four-sided figure in which both pairs of opposite sides are parallel to each other and of equal length and the opposite angles are equal
  • A quadrilateral with two pairs of parallel sides. A rhombus is a quadrilateral with four equal sides and possessing no right angles, a rectangle is a quadrilateral with four right angles and two pairs of sides of equal length, and a square is a quadrilateral with four right angles and four equal sides.

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