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Polygon. Movie
 

A simple closed broken line is called a polygon if its adjacent links do not lie on a straight line. The vertices of a broken line are called the vertices of the polygon, and the links of a broken line are called the sides of the polygon. Polygon diagonals are segments joining non-adjacent polygon vertices.

A plane polygon is a region of a plane bounded by the polygon, which is its boundary. Plane polygon points other than those on its boundary are called interior. A polygonal figure is a union of finite number of plane polygons. Polygonal figures are not overlapped if they have no common interior points. A polygonal figure is called composed of given polygonal figures (divided into given polygonal figures) if it is their union and these figures are not overlapped.

The movie demonstrates examples of triangles, quadrangles and hexagon witch are elements of house construction.

 
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