From http://www.etymonline.com/index.php?term=polyhedronpolyhedron1570, from Gk. polyedron, neut. of adj. polyedros"having many bases or sides," from polys "many" (see poly-) + hedra "seat, base, chair, face of a geometric solid," from PIE base *sed- "to sit" (see sedentary).
So, they are many sided geometric solids.
No. Polyhedrons are any shape with multiple sides. A triangle and a prism are just two different kinds of polyhedrons.
not all
They are 3 dimensional objects such a s polyhedrons.
No, those bounded by only plane faces are but others are not.
Yes, an empty box is and No, polyhedrons don't have to be.
No. Polyhedrons are any shape with multiple sides. A triangle and a prism are just two different kinds of polyhedrons.
not all, but some
not all
tetrahedrons
All polyhedrons.
A prism is a polyhedron.
No. Not even all hexahedrons are cubes.
They are 3 dimensional objects such a s polyhedrons.
...All polyhedrons
No, those bounded by only plane faces are but others are not.
To study solid objects whose faces are all polygons.
Yes, an empty box is and No, polyhedrons don't have to be.