# In geometry, a quadrilateral (from the Latin quadri, "four", and latus, "side") is a polygon with four edges and four vertices or corners. Sometimes, the term quadrangle is used in mathematics for a quadrilateral with no "special" angles. A quadrilateral with four equal length sides is a square, and a quadrilateral with four right angles is a rectangle. A parallelogram is a type of quadrilateral.

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Webster University
##### Lily A.

Johns Hopkins University

##### Heather Z.

Oregon State University

##### Samuel H.

University of Nottingham