A thirteen sided figure (if you are referring to a polygon) is called a tridecagon or 13-gon. Most people however call polygons after 12 sides as n-gons, where n is the number of sides of the polygon but all polygons have their counterpart names that consist of numerical prefixs and suffixs.
Icosagon is a 20 sided figure.
The name of a four sided figure (or shape) is called a Square. :)
The name that is given to an 8 sided figure is a octogan.
A 5 sided figure is called a: pentagon
A 15-sided figure is called a pentadecagon.
The name of am 11-sided figure is a "hendecagon". ---- Also known as an "undecagon".
A 5-sided figure is called a pentagon.
the name of a two sided figure is a jamie n its the coolest shape ever created the name of a two sided figure is a jamy n its the coolest shape ever created
Heptagon - a seven sided two demensional figure
A six sided polygon is an hexagon
icosikaidigon
8 sided figure