no because it has curved faces.
It is the sum of the areas of its four faces.
6
check a reference book
No, those bounded by only plane faces are but others are not.
yes
Polyhedrons are shapes with many faces
no because it has curved faces.
the surface area
An octahedron, for example. 8 faces, 6 vertices.
A shape does not have a sum. You can sum its angles, the lengths of its sides, the areas of its faces and so on. But the shape does not have a sum, in itself.
It is the sum of the areas of each of its faces.
It is the sum of the areas of its four faces.
6
check a reference book
A sphere has no faces an corners. The term "faces" and "corners" are applied to polyhedrons, figures with flat surfaces.
i have no idea why dont you go ask your mamamammamamamamam