When many lines are closed then the enclosed figure is known as polygon. In the polygon the starting point P1 and the ending point P6 are same.
Types of Polygons: Convex and Concave
Convex Polygons: In a convex polygon, any line segment joining any two inside points lies inside the polygon.
Concave Polygons: In a concave polygon, a line segment connecting any two points may or may not lie inside the polygon.