1&6+Polygons

[| 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. 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 regular polygon is a polygon whose sides are all the same length, and whose angles are all the same.**

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: The figure below is not a polygon, since it is not a closed figure: The figure below is not a polygon, since it is not made of line segments: The figure below is not a polygon, since its sides do not intersect in exactly two places each:

[|Calculating the sum of interior angles in a polygon]

[|Rule for calculating the sum of interior angles in a polygon]