First of all it is 'polygon' NOT 'polgon'.
A five sided shape is named a 'pentagon'.
Here is a list for up to 10 sides.
3- trigon (triangle)
4- quadragon ( quadrilateral
5- pentagon
6- hexagon
7 - heptagon
8- octagon
9- nonagon
10 - decagon
100 sides - a centagon.
'--gon' is the name for a 2-dimensional shape
'--hedron' is the name for a 3-dimensional object.
An octagon is a polygon that has 8 sides
The name of a regular polygon with five equal sides and five equal angles is a pentagon. Each of the internal angles is equal to 108 degrees.
A pentagon
A polygon with ten sides would be called a decagon.
That might be a figure as simple as a triangle, as long as it is no special triangle (that is, a triangle with sides of three different lengths).
there is such a thing as an irregular polygon that has sides of different sizes. all REGULAR polygons however have equal sides
Icosogon
Heptagon
It is a triangle
360/18 ie 20 sides
A polygon is a closed 2-D shape with sides made from straight line segments.
it is usually called a heptagon or septagon. but we usually call it a heptagon. :)