no not all pyramids are polyhedron because each pyramid has a different shape. so no each pyramid is not a polyhedron
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Yes they are.
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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..