Definition:Quadrangle

Definition

A quadrangle is a plane figure consisting of $4$ points joined by straight lines.

No $3$ points of a quadrangle are collinear.

Simple Quadrangle

A simple quadrangle is a quadrangle whose $4$ points are joined by $4$ lines, which may or may not intersect.

Complete Quadrangle

A complete quadrangle is a quadrangle whose $4$ points are joined by $6$ lines: one connecting each pair of points.

It is complete because every pair is connected.

Also see

• Definition:Quadrilateral

• Results about quadrangles can be found here.

Sources

• 1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) ... (previous) ... (next): quadrangle
• 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): quadrangle