Question

A polyhedron has 9 faces and 21 edges. How many vertices does it have? Explain your answer.

Answer 1

V + F = E + 2

V +9 =21 +2 =23

Vertices = 14

Answer 2

Step-by-step explanation:

F + V - E = 2

9+ V - 21 = 2

V+21-9 =2

V+12=2

V=12-2

V=10