Question

Faces
Vertices
Edges
?
9
10
4
?
16
5
9
?​

Answer 1

Step-by-step explanation:

According to Euler' s rule

faces + vertices = edges + 2

1) faces + 9 = 10 + 2

faces = 12 - 9 = 3

2 ) 4 + vertices = 16 +2

4 + vertices = 18

vertices = 18 - 4 = 14

3) 5 + 9 = edges + 2

14 = edges + 2

edges = 14 - 2 = 12