A line is a geometric shape made up of 2 points. A polygon is a geometric shape made up of 3 to infinity points. A triangle is a polygon with 3 points A quad is a polygon with 4 points An ngon usually refers to a polygon with more than 4 points.
^ :\ The word "polygon" derives from the Greek πολύς (polús) "much", "many" and γωνία (gōnía) "corner", "angle", or γόνυ (gónu) "knee". So any closed shape that has many angles is a polygon. Ergo the name tri angleeeee, pentagon, hexagon, octagon...