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The name of a polygon with 20 or more sides is called "n-gon".
A regular twenty-sided polygon is called an icosagon.
Well, honey, a regular polygon with 20 sides has 20 lines of symmetry. Each line of symmetry divides the polygon into two equal halves, like splitting a cake. So, if you're looking for balance in your life, just remember that 20 is the magic number for this polygon.
There are 20 common points.
their would be still 2 diagonal lines * * * * * There are 8*(8-3)/2 = 8*5/2 = 20 lines joining two vertices. That being the conventional definition of a diagonal, there are 20 diagonals.