Any polyhedron can be deformed (its angles changed) without affecting the number of edges, vertices or faces.
tetrahedron
Octohedron, or rhomboid.
The same !!
A regular octahedron.
because if you have the same it would be the same shape.
pentagon
Any polyhedron can be deformed (its angles changed) without affecting the number of edges, vertices or faces.
tetrahedron
An octahedron.
You're an octagon.
Octohedron, or rhomboid.
A regular octahedron.
What polyhedron has eight sides and all of the are equilateral triangle?
A polyhedron that has two congruent faces is called a prism. It means that when it is cut at the cross-section, the shape is the same as its base.
The same !!
There are infinitely many polyhedra. There is no limit to the number of faces that a polyhedron can have. Given any polyhedron, simply cut off one vertex so that you will have a polyhedron with one more face. Also there are several versions of polyhedra with the same number of faces. A hexahedron, for example, can be a parallelepiped or a pentagon based pyramid or a triangular based dipyramid.