i think it's a cone
* * * * *
No, it cannot be a cone. But there are a number of possibilities:
A decagonal pyramid = a pyramid whose base is a decagon.
A nonagonal prism = a prism whose bases are nonagons.
A pentagonal pyramid + pentagonal frustum = two pentagonal pyramids stuck together along their pentagonal bases and with one of the apices (plural of apex) cut off.
A cuboid with three corners cut off.
et cetera.
were two or more faces of a solid figure
Polygonal faces.
A square is not a solid figure at all. It's a flat figure, with four congruent faces and four congruent angles.
cone
a cylinder
'Enneahedron' - a solid figure with nine faces
A solid figure with twenty faces is called an Icosahedron.
were two or more faces of a solid figure
Hexahedron
Polygonal faces.
No.
A decaredra is the ten face solid figure.
A square is not a solid figure at all. It's a flat figure, with four congruent faces and four congruent angles.
a sphere
EDGES
cone
tetrahedron