en.wikipedia.org/wiki/List_of_polygons

A regular pentagon **has** 5 equal edges and 5 equal angles. In geometry, a
polygon /ˈpɒlɪɡɒn/ is traditionally a plane **figure** that is bounded by a finite
chain of straight line segments closing in a loop to form a closed chain or circuit.
These segments are called its edges or **sides**, and the points where two ... **eleven**
, eleventh, hendeka, hendekatos.

en.wikipedia.org/wiki/Hendecagon

In geometry, a hendecagon (also undecagon or endecagon) or **11**-gon is an
**eleven**-sided ... The area of a regular hendecagon with **side** length a is given by.
A = **11** 4 a 2 ... The regular hendecagon **has** Dih**11** symmetry, order 22. Since **11**
is a ...

faculty.kutztown.edu/schaeffe/Tutorials/General/Polygons.html

Naming a polygon by its number of **sides** requires that we know the appropriate
Greek ... **11**. = undeca or hendeca. 12. = dodeca. 13. = triskaideca. 14. =
tetradeca. 15 ... When you think **have** the name, click on the ANSWER button to
check.

answers.yahoo.com/question/index?qid=20061121092221AANGCFa

A **11** sided **shape** is a hendecagon right what do you think is a 12 sided **shape**?
Lancastic · 2 ... All together they **have** 12 **sides** and 12 vertices.

mathforum.org/kb/message.jspa?messageID=1077206

Dec 2, 2003 **...** 9= nonagon 10=decagon **11**=undecagon 12=dodecagon i dont know the rest,
but I'm in the 8th grade and I know better than you!

mathcentral.uregina.ca/qq/database/qq.09.96/rosa1.html

... different names? Thank you for your help. Hi Manuel. There seems to be an "
official"set of names for polygons, uniformly derived from the Greek (after 4 **sides**)
.

www.mathsisfun.com/shape.html

Regular Polygons. A polygon is a plane (2D) **shape** with straight **sides**. ...
Nonagon - 9 **Sides**, 2d decagon ... These 2D **shapes have** curves, so are not
polygons: ...

socratic.org/questions/what-is-an-11-and-12-sided-shape-called

Dec 26, 2015 **...** 12 is dodecagon **11** is hendecagon also undecagon or endecagon.

www.infoplease.com/science-health/numbers-and-formulas/polygons-how-many-sides

A geometrical **figure** with three or more **sides** is called a polygon or a polyhedron.
Here are the names for some polygons.