It could be a triangular based pyramid whose technical name is a tetrahedron.
Faces.
a cube
Faces on solid figures are like when you look at a square you see a flat wall type surface.
cone
octagonal prism (i guessed)
sphere
Pyramid
A pyramid.
A Cube is NOT a polygon. A cube is a polyhedron;. A polygon is a 2-dimensional figure of many sides A polyhedron is a 3-dimensional object of many faces. A Cube is an ' Hexahedron' , meaning a solid figure of 6(hexa) faces.
A polyhedron is a solid whose faces are polyhedra, so the question is rather meaningless.
Solid figures are normally named after their number of faces.
A square or rectanglular pyramid are the only solid figures that have exactly five faces.