Question 1166440
.


  From Wikipedia, the free encyclopedia


<pre>
    In geometry, a polygon is a plane figure that is described by a finite number of straight line segments 
    connected to form a closed polygonal chain or polygonal circuit. The solid plane region, the bounding circuit, 
    or the two together, may be called a polygon.
</pre>


See this link

https://en.wikipedia.org/wiki/Polygon


Wikipedia is very reliable and authoritative source of knowledge.