No. Polyhedrons are any shape with multiple sides. A triangle and a prism are just two different kinds of polyhedrons.
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they are not sometimes prisms
Not true.
no not all pyramids are polyhedron because each pyramid has a different shape. so no each pyramid is not a polyhedron * * * * * Yes they are.
Triangles, pyramids, and prisms can all have triangular shapes.
No.