Coba jelasin The corresponding expressions are: dari Segi empat dong

jika panjang dua bimedian dan satu diagonal diberikan, dan

jika panjang dua diagonal dan satu bimedian diberikan.

Quadrilateral Venn Diagram  Quadrilaterals expressed in the form of a Venn diagram, where the areas are also the shape of the quadrilateral they describe.

The role and function of a hierarchical classification of quadrilaterals by Michael de Villiers