no because they don't have the same sides or vertices as the regular ones which are tetrahedral, octahedral, dodecahedral, icosahedral, they are all regular polydrons but not decahedral
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NO
The sides of a rectangle are not all equal so a rectangle is not a regular polygon. And, as a consequence, any 3-dimensional shape made from rectangles cannot be a regular polyhedron.
No, it is not.
No.
Not necessarily. If all faces are equilateral triangles (all edges are equal length) then it is a regular polyhedron.