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Concept 3.2j : Polygons
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Idea:
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OpenGL provides GL_POLYGONS to render polygons.
GL_POLYGON:
Draws a polygon using the points Vo,... , Vn-1
as vertices.  n must be atleast 3 or nothing
is drawn.  all previous examples we have seen i.e.
triangles, quadrilaterals are just specialized
examples of polygons. Also OpenGL polygons must
be convex, and the edges of a polygon may not 
intersect.

Experiment:
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Render a pentagon (five sided polygon) with its center
at the origin.