Is the shape below a polyhedron? Explain your answer.

Answer:
No
Explanation below
Step-by-step explanation:
Definition of Polyhedron (Wikipedia)
In geometry, a polyhedron ( pl. : polyhedra or polyhedrons; from Greek πολύ (poly-) 'many', and ἕδρον (-hedron) 'base, seat') is a three-dimensional shape with flat polygonal faces, straight edges and sharp corners or vertices.
From this definition we see that the given shape is not a polyhedron since one of the faces is curved and not flat