POLIGONS

STAR POLYGONS

It is a perpendicular poligon case with a star shape , created out of linking together non consecutive vertex of a regular poligon. 

CONVEX POLYGONS 

Any line trough to the polygon , it has to touch only two points . 

CONCAVE

When a line trough to the polygon, the line intersct in more points .

THE TRIANGLES 

It's a flat figure with three sides ad three angles