Četverokut

Četverokut ili četverougao je zatvoren geometrijski lik koji ima četiri kuta i četiri stranice. Zbroj svih kutova u četverokutu iznosi 360°.

Podjela četverokuta:

• trapez
• pravokutnik
  • kvadrat
• paralelogram
  • romb

Vanjski linkovi

• Varignon and Wittenbauer Parallelograms by Antonio Gutierrez from "Geometry Step by Step from the Land of the Incas"
• Van Aubel's theorem Quadrilateral with four squares by Antonio Gutierrez from "Geometry Step by Step from the Land of the Incas"
• Compendium Geometry Analytic Geometry of Quadrilaterals
• Quadrilaterals Formed by Perpendicular Bisectors
• Projective Collinearity in a Quadrilateral