Triangular prisms and square-based pyramids have 5 faces.
Trapezoid prisms and cubes have 6 faces.
Hexagonal prisms and octahedrons have 8 faces.
Polyhedrons are shapes with many faces
no because it has curved faces.
An octahedron, for example. 8 faces, 6 vertices.
check a reference book
No, those bounded by only plane faces are but others are not.
To study solid objects whose faces are all polygons.
No because they have many faces which is the meaning of the word polyhedron
A sphere has no faces an corners. The term "faces" and "corners" are applied to polyhedrons, figures with flat surfaces.
Yes and the flat surfaces are called faces