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www.reference.com/article/11-sided-polygon-223e7008e8ba8b8f

An 11-sided polygon is called a hendecagon. In order for an 11-sided shape to be considered a hendecagon, its sides must all be straight and form a closed shape.

www.reference.com/article/5-sided-polygon-ac23d370568dc0fe

A five-sided polygon is called a pentagon. A pentagon also has five vertices and five interior angles, which add up to a total of 540 degrees.

www.reference.com/article/10-sided-polygon-c3e9e5b6f26b68df

A 10-sided polygon is referred to as a decagon. "Deca" is used as a prefix that means 10, and it is used to create compound words.

www.reference.com/world-view/many-sides-polygon-432f61fa706290bd

A polygon is a plane figure that has "at least three straight sides and angles," according to Oxford Dictionaries. However, polygons can have more than three sides; most have five or more.

www.reference.com/world-view/10-sided-polygon-called-ee570646b9447467

A polygon with 10 sides is called a decagon. The word comes from the Greek words for "ten" ("deka") and for "angle" or "corner" ("gonia"). Decagons have 10 angles and 10 sides.

www.reference.com/world-view/7-sided-polygon-called-d61e641b00de6aa2

A polygon with seven sides is called a heptagon. A polygon is a closed geometric shape that has at least three sides and angles.

www.reference.com/world-view/100-sided-polygon-called-d88be3d052d1649a

A 100-sided polygon is called a hectogon, centagon or 100-gon. In general, any n-sided polygon with over 12 sides is called an n-gon. While there are other conventions for naming polygons with any number of sides, it is most common to use the n-gon form.

www.reference.com/article/8-sided-polygon-called-95155c5cbde872a5

An 8-sided polygon is called an octagon. One common use of the octagon is in the iconic red stop sign that's used throughout the United States.

www.reference.com/world-view/25-sided-polygon-called-73adce10cc83e669

A polygon with 25 sides is called a icosikaipentagon. Polygon names are constructed according to the tens unit and the single digit unit.

www.reference.com/article/11-sided-polygon-called-b469197c3dce7b9

An 11-sided polygon is called a hendecagon. It is also known as the undecagon or unidecagon. However, the term "hendecagon" takes precedence over these variants because of its consistency in using a Greek prefix and suffix, instead of combining a Roman prefix with a Greek suffix.