Answer :

(a) A polyhedron with 4 vertices and 4 faces is tetrahedron.

(b) The only Solid object with no vertex is Sphere.

(c) The possible polyhedrons with 12 edges are a cube, cuboid, Hexagonal Pyramid.

(d) The Only solid object with 1 face is Sphere.

(e) Cube is a Regular Polyhedron (All faces are identical)

Whereas Cuboid is not a Regular Polyhedron (All faces are not identical)

(f) Cube and Cuboid have a same number of faces, edges, vertices.

That is 6 faces, 12 edges, 8 vertices.

(g) A Polyhedron with 5 vertices and 5 faces is square Pyramid.

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