Which amongst the following is not a polyhedron?
Explanation for the correct option:
Determine polyhedron:
A polyhedron is regular if its faces are congruent regular polygons and the same number of faces meet at each vertex.
A polyhedron is just a three-dimensional solid consisting of a group of polygons, ordinarily connected at their edges.
In other words, a polyhedron is a three-dimensional variant of the most common polytope, which defines an arbitrary dimension. The plural name of a polyhedron is “polyhedra” or sometimes “polyhedrons”.
Hence, the correct answer is “option C”.