Based on their interior angles, all hexagons are classified into two groups: convex and concave.

What is a Convex Hexagon

A convex hexagon is a hexagon having each interior angle less than 180°. Each of the vertices of a convex hexagon always points outwards. All the diagonals of such a hexagon lie inside the closed figure. It can be regular or irregular.

What is a Concave Hexagon

A concave hexagon is a hexagon that has at least one interior angle greater than 180°. At least one vertex of a concave hexagon points inwards. It has at least one diagonal lying outside the closed figure. It is always an irregular hexagon.