Quadrilateral
Pronunciation: /ˌkwɒ.drəˈlæt.ər.əl/ Explain
Click on the blue points in the figure and drag them to change the figure.
 Manipulative 1  Types of Quadrilaterals Created with GeoGebra. 

A quadrilateral is any foursided polygon. Many of the
figures studied in elementary
plane geometry
are quadrilaterals. Manipulative 1 shows different types of
quadrilaterals and their names.
 A quadrilateral is a
polygon
with four sides.
 A kite
is a quadrilateral where two pair of adjacent sides are equal.
 A trapezoid
is a quadrilateral with two sides that are
parallel.
The parallel sides are opposite each other.
 A parallelogram
is a quadrilateral where both sets of opposite sides are parallel.
 A rectangle
is a parallelogram where the sides meet at
right angles.
 A rhombus
is a quadrilateral with four equal sides.
 A square
is a rectangle with equal sides.

References
 McAdams, David E.. All Math Words Dictionary, quadrilateral. 2nd Classroom edition 201501084799968. pg 148. Life is a Story Problem LLC. January 8, 2015. Buy the book
 Casey, John, LL.D., F.R.S.. The First Six Books of the Elements of Euclid. pg 9. Translated by Casey, John, LL.D. F.R.S.. www.archive.org. Hodges, Figgis & Co.. 1890. Last Accessed 12/4/2018. http://www.archive.org/stream/firstsixbooksofe00caseuoft#page/9/mode/1up/search/quadrilateral. Buy the book
 Stöcker, K.H.. The Elements of Constructive Geometry, Inductively Presented. pg 22. Translated by Noetling, William A.M, C.E.. www.archive.org. Silver, Burdett & Company. 1897. Last Accessed 12/4/2018. http://www.archive.org/stream/elementsofconstr00noetrich#page/22/mode/1up/search/quadrilateral. Buy the book
 Keller, Samuel Smith. Mathematics for Engineering Students, Plane and Solid Geometry. pg 33. www.archive.org. D. Van Nostrand Company. 1908. Last Accessed 12/4/2018. http://www.archive.org/stream/mathengineer00kellrich#page/33/mode/1up/search/quadrilateral. Buy the book
 Convex. ams.org. Geometry Glossary. American Mathematical Society. Last Accessed 12/4/2018. http://www.ams.org/featurecolumn/archive/geometryglossary.html.
Cite this article as:
McAdams, David E. Quadrilateral. 3/28/2019. All Math Words Encyclopedia. Life is a Story Problem LLC. http://www.allmathwords.org/en/q/quadrilateral.html.
Image Credits
Revision History
12/21/2018: Reviewed and corrected IPA pronunication. (
McAdams, David E.)
12/3/2018: Removed broken links, updated license, implemented new markup, updated geogebra app. (
McAdams, David E.)
8/7/2018: Changed vocabulary links to WORDLINK format. (
McAdams, David E.)
8/3/2018: Initial version. (
McAdams, David E.)