Segi empat: Perbedaan antara revisi
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== Segi empat kompleks ==
[[Berkas:DU21 facets.png|thumb|upright=0.8|Antiparallelogram]]
Sebuah berpotongan sendiri segiempat disebut dengan berbagai sebuah '''cross-segiempat''', menyeberangi segiempat, '''kupu-kupu segiempat''' atau '''kupu-kupu segiempat'''. Dalam segiempat melintang, empat "interior" sudut di kedua sisi persimpangan (dua refleks akut dan dua , semua di sebelah kiri atau semua di sebelah kanan saat gambar ditelusuri) menambahkan hingga 720 °.<ref>
* [[Palang trapesium]] (AS) atau trapezium (Persemakmuran):<ref>{{cite web | url=https://blogs.adelaide.edu.au/maths-learning/2016/04/06/the-crossed-trapezium/ | title=The crossed trapezium | last=Butler | first=David | date=2016-04-06 | website=Making Your Own Sense | access-date=2017-09-13}}</ref> silang segiempat di mana (seperti trapesium ) sepasang sisi yang tidak berdekatan adalah sejajar
Baris 157:
* [http://www.mathopenref.com/tocs/quadrilateraltoc.html Definitions and examples of quadrilaterals] and [http://www.mathopenref.com/tetragon.html Definition and properties of tetragons] from Mathopenref
* [http://dynamicmathematicslearning.com/quad-tree-web.html A (dynamic) Hierarchical Quadrilateral Tree] at [http://dynamicmathematicslearning.com/JavaGSPLinks.htm Dynamic Geometry Sketches]
* [http://mysite.mweb.co.za/residents/profmd/quadclassify.pdf An extended classification of quadrilaterals] {{Webarchive|url=https://web.archive.org/web/20191230004754/http://mysite.mweb.co.za/residents/profmd/quadclassify.pdf |date=2019-12-30 }} at [http://mysite.mweb.co.za/residents/profmd/homepage4.html Dynamic Math Learning Homepage] {{Webarchive|url=https://web.archive.org/web/20180825150046/http://mysite.mweb.co.za/residents/profmd/homepage4.html |date=2018-08-25 }}
* [http://comic.socksandpuppets.com/view.php?date=2008-02-08 Quadrilateral Venn Diagram] {{Webarchive|url=https://web.archive.org/web/20110907024856/http://comic.socksandpuppets.com/view.php?date=2008-02-08 |date=2011-09-07 }} Quadrilaterals expressed in the form of a Venn diagram, where the areas are also the shape of the quadrilateral they describe.
* [https://web.archive.org/web/20110719175018/http://mzone.mweb.co.za/residents/profmd/classify.pdf The role and function of a hierarchical classification of quadrilaterals] by Michael de Villiers
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