Hilingon an source kan Kwadrilatero

{{Infobox Polygon|name=Kwadrilatero|image=Six Quadrilaterals.svg|caption=Nagkapirang mga klase nin kwadrilatero|edges=4|schläfli={4} (para sa kwadrado)|area=baryenteng mga paagi|angle=90° (para sa kwadrado asin rektangulo)}}

An '''kwadrilatero''' ([[Ingles]]: ''quadrilateral'') iyo sarong [[poligono]] sa Euclideyanong patag na [[heometriya]] na igwang apat na gilid asin apat na kanto. An ibang ngaran para sa kwadrilatero iyo kabali an '''kwadranggulo''' (''quadrangle'' sa Ingles bilang analohiya sa [[triangulo]]), '''tetragono''' (tetragon sa Ingles bilang analohiya sa [[pentagono]] asin [[heksagono]]), asin '''4-gon''' (bilang analohiya sa mga ''n''-gon para sa arbitraryong bilang kan ''n''). An sarong kwadrilatero na may mga kanto na <math>A</math>, <math>B</math>, <math>C</math> asin <math>D</math> iyo inaapod man na <math>\square ABCD</math>.<ref>{{Cite web|date=2020-04-17|title=List of Geometry and Trigonometry Symbols|url=https://mathvault.ca/hub/higher-math/math-symbols/geometry-trigonometry-symbols/|access-date=2020-09-02|website=Math Vault|language=en-US}}</ref><ref name=":0">{{Cite web|title=Quadrilaterals - Square, Rectangle, Rhombus, Trapezoid, Parallelogram|url=https://www.mathsisfun.com/quadrilaterals.html|access-date=2020-09-02|website=www.mathsisfun.com}}</ref>

An katagang "quadrilateral" iyo gikan sa mga Latinong kataga na ''quadri'', sarong baryente nin apat, asin ''latus'', boot-sabihon iyo "gilid".

An mga kwadrilatero iyo simple (dae nagsasarabatan nin sadiri), o komplekso (nagsasarabatan nin sadiri). An mga simpleng kwadrilatero iyo pwedeng ''convex'' o ''concave''.

An mga panlaog na anggulo nin sarong simple (asin patag) na kwadrilatero ''ABCD'' iyo may kabilugan kapag nadugang na 360 degri nin arko, na iyo<ref name=":0" />

: <math>\angle A+\angle B+\angle C+\angle D=360^{\circ}.</math>

Ini iyo espesyal na kaso kan kabilugan nin mga panlaog na anggulo kan ''n''-gon na pormula: (''n'' − 2) × 180°.

==Mga panluwas na takod==
{{Commons category|Tetragons|Mga tetragono}}
* {{springer|title=Quadrangle, complete|id=p/q076010}}
* [http://www.cut-the-knot.org/Curriculum/Geometry/PerpBisectQuadri.shtml Quadrilaterals Formed by Perpendicular Bisectors], [http://www.cut-the-knot.org/Curriculum/Geometry/ProjectiveQuadri.shtml Projective Collinearity] asin  [http://www.cut-the-knot.org/Curriculum/Geometry/Quadrilaterals.shtml Interactive Classification] nin mga Kwadrilatero gikan sa ''cut-the-knot''
* [http://www.mathopenref.com/tocs/quadrilateraltoc.html Definitions and examples of quadrilaterals] asin [http://www.mathopenref.com/tetragon.html Definition and properties of tetragons] gikan sa Mathopenref
* [http://dynamicmathematicslearning.com/quad-tree-new-web.html A (dynamic) Hierarchical Quadrilateral Tree] sa [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 }} sa [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 }}
* [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] ni Michael de Villiers

== Toltolan ==
{{reflist}}
{{matematika-tamboan}}
[[Kategorya:Mga kwadrilatero]]