Pronunciation: /ˌpær.əˈlɛl.əˌgræm/ Explain
Click on the blue points and drag them to change the figure. No matter where you drag them, the figure is a parallelogram.

Can a parallelogram also be a rectangle? How? Can a parallelogram also be a cube? How?
Manipulative 1 - Parallelogram Created with GeoGebra.

A parallelogram is a four sided polygon whose opposite sides are parallel.[2][3]

Properties of Parallelograms

Click on the blue points to change the figure. Click on the check boxes to show and hide the properties.

Manipulative 2 - Parallelogram Properties Created with GeoGebra.
Properties of a parallelogram:
  • The opposite angles of a parallelogram are congruent.
  • The opposite sides of a parallelogram are congruent and parallel.
  • The diagonals bisect each other.
  • Each diagonal bisects the parallelogram into two congruent triangles.
  • The sums of the angles of a parallelogram is 360° or radians.
  • A tessellation of a plane can be created using any parallelogram.
  • The area of a parallelogram is A = bh where A is the area, b is the base and h is the height.


  1. McAdams, David E.. All Math Words Dictionary, parallelogram. 2nd Classroom edition 20150108-4799968. pg 134. Life is a Story Problem LLC. January 8, 2015. Buy the book
  2. Hilbert, David. The Foundations of Geometry. pp 28,33-35. Translated by Townsend, E. J., Ph. D.. The Open Court Publishing Company. 1950. Last Accessed 12/3/2018. Buy the book
  3. Stöcker, K.H.. The Elements of Constructive Geometry, Inductively Presented. pp 23, 32-33. Translated by Noetling, William A.M, C.E.. Silver, Burdett & Company. 1897. Last Accessed 12/3/2018. Buy the book
  4. Keller, Samuel Smith. Mathematics for Engineering Students, Plane and Solid Geometry. pp 44, 34-36, 72-73. D. Van Nostrand Company. 1908. Last Accessed 12/3/2018. Buy the book

Cite this article as:

McAdams, David E. Parallelogram. 3/26/2019. All Math Words Encyclopedia. Life is a Story Problem LLC.

Image Credits

Revision History

3/26/2019: Corrected formula for area in manipulative 2. (McAdams, David E.)
12/21/2018: Reviewed and corrected IPA pronunication. (McAdams, David E.)
12/1/2018: Removed broken links, updated license, implemented new markup, updated geogebra app. (McAdams, David E.)
8/28/2018: Corrected spelling. (McAdams, David E.)
8/7/2018: Changed vocabulary links to WORDLINK format. (McAdams, David E.)
12/21/2009: Added "References". (McAdams, David E.)
10/24/2008: Initial version. (McAdams, David E.)

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