## Compare with Definitions

A four-sided plane figure, especially a square or rectangle.

A quadrilateral is a polygon in Euclidean plane geometry with four edges (sides) and four vertices (corners). Other names for quadrilateral include quadrangle (in analogy to triangle) and tetragon (in analogy to, e.g., pentagon or hexagon).

A square or rectangular space or courtyard enclosed by buildings.

A polygon having four sides.

Having four sides.

A rectangular area surrounded on all four sides by buildings.

A polygon with four sides.

The buildings bordering this area.

An area defended by four fortresses supporting each other.
The Venetian quadrilateral comprised Mantua, Peschiera, Verona, and Legnano.

The area of land shown on one atlas sheet charted by the US Geological Survey.

Having four sides.

(geometry) A geometric shape with four angles and four straight sides; a four-sided polygon.

Having four sides, and consequently four angles; quadrangular.

A plane figure having four sides, and consequently four angles; a quadrangular figure; any figure formed by four lines.

The buildings forming the border of such a courtyard.

An area defended by four fortresses supporting each other; as, the Venetian quadrilateral, comprising Mantua, Peschiera, Verona, and Legnano.

A plane figure having four angles, and consequently four sides; any figure having four angles.

A four-sided polygon

A square or quadrangular space or inclosure, such a space or court surrounded by buildings, esp. such a court in a college or public school in England.

Having four sides

A four-sided polygon