yes
no not all pyramids are polyhedron because each pyramid has a different shape. so no each pyramid is not a polyhedron * * * * * Yes they are.
No. A pyramid is a polyhedron. Many pyramids are polyhedra.
Yes when in the form of a tetrahedron which is a triangular based pyramid
For every polyhedron, there is a dual which is a polyhedron that has:a face where the first had a vertex,a vertex where the first had a face,the same number of edges.A self-dual polyhedron is a polyhedron whose dual is the same shape.All pyramids, for example, are self-dual.
An octahedron, which looks like 2 pyramids glued bottom to bottom.
A polyhedron. Examples include pyramids and cubes.
Pyramids are a type of polyhedron that has a polygonal base with triangles extending from it to form an apex. The pyramids of Egypt would be examples of square pyramids because the bottom of them are squares. Likewise, you could have a pentagonal pyramid, hexagonal pyramid, pentagrammic pyramid etc.
the great pyramids are found in egypt
the great pyramids are in Egypt and they are in Sudan.
A triangular dipyramid - two triangular pyramids stuck together, base-to-base.
An octahedron - which is like two rectangular pyramids whose bases have been stuck together.
The Great Sphinx and the Great Pyramids are in Giza, Egypt.