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http://www.youtube.com/watch?v=73sXJ36N894&feature=fvw

1&6 Polygons


A polygon is a closed plane figure bounded by straight sides.

A polygon can be any shape or size, but it can not have any openings.
A regular polygon is a polygon whose sides are all the same length, and whose angles are all the same.
Any closed figure formed by three or more line segments is called a polygon. The word "polygon" derives from the
Greek words poly (many) and gonu (knee). So a polygon is a thing with many knees! Think about the shape of a stop sign,
the floor in a room, and a saw






A polygon is a closed figure made by joining line segments, where each line segment intersects exactly two others.
Examples:
The following are examples of polygons:
external image IMG00049.GIF
external image IMG00049.GIF

The figure below is not a polygon, since it is not a closed figure:
external image IMG00050.GIF
external image IMG00050.GIF

The figure below is not a polygon, since it is not made of line segments:
external image IMG00051.GIF
external image IMG00051.GIF

The figure below is not a polygon, since its sides do not intersect in exactly two places each:
external image IMG00052.GIF
external image IMG00052.GIF


Calculating the sum of interior angles in a polygon

Rule for calculating the sum of interior angles in a polygon