A nonagon is a closed shape that has nine sides. If it is a regular nonagon, all nine sides are the same length, and all the angles are equal.
The sum of the interior angles of a nonagon is 1260 degrees. If it is a regular nonagon, then all nine angles have the same measurement of 140 degrees.
The term "nonagon" was coined during the 17th century from a combination of words. It begins with the Latin word "nonus," which means "nine." The last part of the word "gon" is patterned after Latin and Greek words meaning "angle. " Literally translated, "nonagon" means "nine angles."
Okay, you are taking me back to elementary school with this one. A ninesided shape is called a nonagon. Now, you and I both know what it's called!
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A nine sided shape is called a nonagon.
http://wiki.answers.com/Q/What_do_call_a_9_side_sh...

A one thousand sided regular polygon is called a chiliagon. chiliagon (a polygon with 1000 sides)
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A milligon.
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