A ninesided polygon is commonly called a nonagon. This polygon, which has nine edges, or vertices, is also called an enneagon. The term enneagon is preferable, but less popular than the name nonagon because the latter is simpler to spell and pronounce, according to Wolfram MathWorld.
The name enneagon is derived from the Greek word enneagonon, which is a combination of two terms that mean nine and corner. The name nonagon, in contrast, has a mixed Roman and Greek origin. It is from the Latin word nonus, which means ninth, added to the suffix gonon. Both enneagon and nonagon are accepted terms to refer to a polygon with nine sides.
A five sided polygon is called a pentagon. A pentagon also had five points. There are 540 degrees that make up the interior angles of a pentagon.
http://www.ask.com/webanswers/Science/Mathematics...

a polygon with 9 sides is called a nonagon
http://wiki.answers.com/Q/What+is+2+polygons+with+...

A nine sided polygon is called a nonagon Thanks for using ChaCha!
http://www.chacha.com/question/whatisa9sidedp...

The nine (9) sided polygon is called as Nonagon or Enneagon. The name "nonagon" is a prefix hybrid formation, from Latin (nonus, "ninth" + gonon).
http://www.kgbanswers.com/whatisthenameofa9...
