EngelseVlag EN
 
At this site you will find mathematical subjects I investigated. All pages are in English. Some pages are also available in Dutch. When a change of language is possible it is shown at the top of the page.
 
 
Chris van Tienhoven, the Netherlands
 
NL  NL
 
Op deze site vindt u enige wiskundige onderwerpen waar ik onderzoek naar gedaan heb. Alle pagina’s zijn in het Engels. Sommige pagina’s zijn ook in het Nederlands. Wanneer er een taalkeuze is, dan staat dit bovenaan de pagina d.m.v. een (NL-)vlag.
 
Chris van Tienhoven, Nederland
 
 
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ENCYCLOPEDIA  OF  QUADRI-FIGURES
(EQF)
 
This  encyclopedia  is  dedicated  to  Quadri-figures.
A Quadri-figure is a figure constructed from 4 points and/or 4 lines.
 
 
 
                          E Q F - D E F I N I T I O N S 
 
P R O P E R T I E S 
 
QA-Quadrangle-00 2
 A quadrangle is a geometrical figure consisting of 4 points.
 There is no order in these points.
 Abbreviation: QA
A Quadrangle produces:
  • 6 connecting lines
  • 4 component triangles
  • 3 component quadrigons
  • 1 diagonal triangle
QL-Quadrilateral-00 2 
 A quadrilateral is a geometrical figure consisting of 4 lines.
 There is no order in these lines.
Abbreviation: QL
A Quadrilateral produces:
  • 6 intersection points
  • 4 component triangles
  • 3 component quadrigons
  • 1 diagonal triangle
QG-Quadrigon-00 2
 
 
 
 A quadrigon is a geometrical figure consisting of
 4 consecutive points and 4 consecutive connecting lines.
 There is a cyclic order in these points & lines.
 Abbreviation: QG
 
 
 
 
A Quadrigon produces:
  • 2 pairs of opposite lines
  • 2 pairs of opposite points
  • 2 diagonals
  • 1 third diagonal
  • 1 diagonal crosspoint
 
 
 
              The results of EQF also can be downloaded as a PDF-file.