INTRODUCTION TO POLYGON. YOUTUBE : https://youtube.com/c/ESOMNOFUONLINEMATH. A circle is not really a polygon. A polygon is bounded by 3 or more straight lines. It might sound a hyperbole but I think we can see circle as a polygon as well. So, the smallest polygon is a Triangle Add another line to it - Rectangle Another line to the previous figure - Pentagon However, if we keep on adding the number of lines to the polygon, where the length of the line would be infinitely small( Like really small