A polyhedron has 9 vertices and 16 edges. How many faces does it have?

Answer: 9 faces

Step-by-step explanation:

In geometry, we use Euler's formula, and it looks like this:

V - E + F = 2

where

V = the number of vertices of a polyhedron

E = the number of edges of a polyhedron

F = the number of faces of a polyhedron.

V = 9

E = 16

F = ?

V - E + F = 2

9 - 16 + F = 2

F = 2 + 16 - 9

F = 9