The name of a polygon with 20 or more sides is called "n-gon".
A polygon with 20 sides is an icosagon.
It has 360/20 = 18 sides
The name of a polygon with 15 sides is a pentadecagon
There is no such figure as a 20 degrees polygon.
There is a corresponding side to every angle. 20... A polygon has as many sides as it does angles.
There is no formula for how many sides there are in a polygon; the name of the polygon shows how many sides it has.
There is no name because such a polygon does not exist. A polygon must have at least three sides.
A pentagon is the polygon with 5 sides.
A polygon with seven sides is a heptagon.
There is not a name for such a polygon. A polygon with one million sides is called a megagon though..
icosagon