No. Polyhedrons are any shape with multiple sides. A triangle and a prism are just two different kinds of polyhedrons.
Not true.
they are not sometimes prisms
not all
These could be called solids.There are lots of three dimensional shapes. Cubes, spheres, cylinders, cones, toroids, pyramids, helixes, the various polyhedrons..
No. Polyhedrons are any shape with multiple sides. A triangle and a prism are just two different kinds of polyhedrons.
Not true.
they are not sometimes prisms
true
true
Polyhedrons such as pyramids and cuboids
Both pyramids and prisms are three dimensional. Both of them have polygon faces. Another thing common about pyramids and prisms is that they have a base and faces.
not all, but some
not all
tetrahedrons
All polyhedrons.
A prism is a polyhedron.