There are infinitely many possible answers. Common ones are are octagonal-based pyramid, an octagonal prism, on octagonal antiprism.
An octagon is a plane figure. It has eight sides, but no real base.
An 8 sided figure is an octagon.
This figure is a CONE.
An 8-sided plane figure is an octagon.
cone
Yes, an eight-sided figure is called an octagon.
An octagon is an eight-sided figure.
Normally, 'Octagon' octagon
A cone
Cylinder
This is an octagon. "Octa" means "8". You can tell how many sides a polygon has by its prefix.
An eight sided figure is an octagon.