please help me with the chapter more about polygons please

Dear Student,
It would be more convenient if you could please write your doubt here so that we may help you appropriately. 


Although here is the definition of polygons

A polygon is a plane   shape with straight sides. 

Polygons are 2-dimensional shapes. They are made of straight lines, and the shape is "closed" (all the lines connect up).

Following diagram shows the various polygons: