Q: What is the sum of the areas of a polyhedron's faces?

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no because it has curved faces.

6

check a reference book

It is the sum of the areas of its four faces.

No, those bounded by only plane faces are but others are not.

Related questions

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.

6

check a reference book

It is the sum of the areas of each of its faces.

It is the sum of the areas of its four faces.

A sphere has no faces an corners. The term "faces" and "corners" are applied to polyhedrons, figures with flat surfaces.

To study solid objects whose faces are all polygons.