A polyhedron with 20 vertices and 30 faces has ___ edges.
50
48
46
10
V = 20, F = 30, E = ?
Using Euler's formula we get
F + V - E = 2
30 + 20 - E = 2
50 - E = 2
E = 48
If a polyhedron has 15 vertices and 20 edges, then it has ___ faces.