A fivesided polygon, with five vertices and five angles, is called a pentagon. The word pentagon is derived from the Greek words "pente" and "gonia," which mean "five" and "angle."
If a pentagon consists of equal sides and equal angles, it is referred to as a regular pentagon; otherwise, it is called an irregular pentagon. The interior angles of a regular polygon measure 108 degrees. A pentagon consists of five straight, connected sides. If one of the five sides of a given shape is a curved line or if the fivesided shape is not a closed figure, then it is not a pentagon.
A pentagon.
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A fivesided polygon is called a pentagon. A sixsided polygon is called a hexagon. kgb_ knows math!
http://www.kgbanswers.com/whatisafivesidedpol...

They are called sides. A simple polygon is a triangle. A 4sided polygon is a
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A 19sided polygon is an enneadecagon (also enneakaidecagon or nonadecagon).
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