A polygon is a closed 2D geometrical figure made up of line segments. Examples of polygons are : triangle, square, rhombus, and many more.

Convex polygon: each of its interior angle is less than , and all of the diagonals live inside the polygon.

Concave polygon: at least one interior angle is greater than , and at least 1 diagonal lies outside of the polygon.

Regular polygon: all sides and all interior angles are equal

There are many examples of polygons: