Use Euler’s formula to find the missing number.
Vertices: 13
Edges: 28
Faces: ?
To find the number of faces, we can use Euler's formula:
V - E + F = 2
Given:
V = 13 (vertices)
E = 28 (edges)
Plug in these values and solve for F:
13 - 28 + F = 2
-15 + F = 2
F = 2 + 15
F = 17
Therefore, the number of faces is 17.