== {{-it-}} ==
{{-sost-|it}}
{{Pn|w}} ''m inv''
# {{Term|matematica|it}} {{Term|geometria|it}} [[poligono]] [[regolare]] [[formato]] da 18 [[lati]]

{{-sill-}}
; ot | ta | de | cà | go | no

{{-etim-}}
da [[otta-]], [[deca-]] e [[-gono]]

{{-ipon-}}
*[[poligono]]

{{-trad-}}
{{Trad1|}}
:* {{en}}: [[octadecagon]]
{{Trad2}}

{{-ref-}}
*[http://mathworld.wolfram.com/Octadecagon.html]

==Altri progetti==
{{Interprogetto|w}}