A pyramid is a four-sided, three-dimensional figure.
Icosagon is a 20 sided figure.
The name of a four sided figure (or shape) is called a Square. :)
The name of am 11-sided figure is a "hendecagon". ---- Also known as an "undecagon".
a 3 sided figure
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 triangle
A polygon refers to a plane figure that has at least three straight sides and angles. An 18 sided shape is called an octadecagon or octakaidecagon.
icosikaidigon
8 sided figure