Question

Which of the following is/are non-polyhedron(s)?

• A.
• B.
• C.
• D.

Answer 1

Answer: (C), (D)

Non-polyhedron: A 3-dimensional solid with at least one curved face.

Polyhedron: A 3-dimensional solid with flat polygonal faces, straight edges and sharp corners or vertices.

Let's check for all the options.

Given pyramid is satisfying all conditions of a polyhedron.

Given cuboid is satisfying all conditions of a polyhedron.

Given cone has a curved surface, so it is a non-polyhedron.


Given cylinder has a curved surface, so it is a non-polyhedron.

Options (c.) and (d.) are correct choices.