Such a figure is a pyramid.
Pyramid
pyramid
a polygonal prism or a polygond
The description given fits to that of a pyramid
Such a figure is a pyramid.
octagonal prism (i guessed)
A pyramid.
Pyramid
A polygonal pyramid.
pyramid
pyramid
A cube is a solid figure called a polyhedron. A polyhedron is a solid figure with all flat faces. So a cone would be a solid figure but not a polyhedron becasue it has a curve and does not have all flat faces.
pyramid
It is a prism.
a polygonal prism or a polygond
a rectangular pyramid and a square pyramid