An octagon is an 8 sided 2 dimensional shape. A cylinder with the base of a hexagon (6 sided shape) would be an 8 sided 3 dimensional shape.
A 12-sided shape is called a dodecagon.
Parallelogram
Octagon is a 8 sided shape. Jesse-lee Caruana
Dooctahedron
A Hectagon.
Octagon.
Octagon
Octagon.
you call a seven sided shape a heptagon.
An octagon is an 8 sided 2 dimensional shape. A cylinder with the base of a hexagon (6 sided shape) would be an 8 sided 3 dimensional shape.
An 11 sided shape is an Eptogon
A seven sided shape is called a heptagon.
A 12-sided shape is called a dodecagon.
A 30 sided shape is called a Triacontagon.
An eight-sided shape is called an octagon.
You can call a 101-sided shape a hecatontakaihenagon. The "hecto-" in the word means "one hundred" and the "henagon" means "one-sided geometric shape."