A parallelogram is a four-sided object that has parallel opposite sides. A square is a parallelogram. If you take the square and tilt it to one side, it’s still a parallelogram as long as its lines remain parallel.

A parallelogram is a two-dimensional object that you might have already encountered in geometry class. You can recognize a parallelogram by its parallel opposite sides, and also by its opposite angles that are equal. Adjacent angles on a parallelogram always add up to 180 degrees. If the angles of a parallelogram are 90 degrees, then it’s straight up and down, like a square or a rectangle.

Definitions of parallelogram
  1. noun
    a quadrilateral whose opposite sides are both parallel and equal in length
    see moresee less
    a quadrilateral with no parallel sides
    show 5 types...
    hide 5 types...
    diamond, lozenge, rhomb, rhombus
    a parallelogram with four equal sides; an oblique-angled equilateral parallelogram
    a parallelogram with adjacent sides of unequal lengths; an oblique-angled parallelogram with only the opposite sides equal
    a parallelogram with four right angles
    foursquare, square
    (geometry) a plane rectangle with four equal sides and four right angles; a four-sided regular polygon
    a rectangular drawing
    type of:
    quadrangle, quadrilateral, tetragon
    a four-sided polygon
Word Family
F1 image

Express yourself in 25 languages

  • Learn immersively - no memorization required
  • Build skills for real-world conversations
  • Get immediate feedback on your pronunciation
Get started for $7.99/month