Which are polyhedrons from the following?

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Solution

(i) It is made up of curved surfaces and polygonal faces, so it is a non-polyhedron.
(ii) It is made up of polygonal regions only, so it is a polyhedron.
(iii) It is made up of polygonal regions only, so it is a polyhedron.
(iv) It is made up of polygonal regions only, so it is a polyhedron.
(v) It is made up of curved surfaces and polygonal faces, so it is a non-polyhedron.

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