A polyhedron with 8 edges and 5 faces has ___ vertices.
F = 5, V = ?, E = 8
Using Euler's formula we have
F + V - E = 2
5 + V - 8 = 2
V - 3 = 2
V = 5
If a polyhedron has 6 faces and 8 vertices, then it has ___ edges.
A polyhedron with 20 vertices and 30 faces has ___ edges.
If a polyhedron has 8 faces and 8 vertices, find the number of edges in it.