Question

Using Euler’s Formula (F + V = E + 2), find the number of edges. Faces: 25 Vertices: 17 Edges: ?

Answer 1

F + V = E + 2

25 + 17 = E + 2

42 = E + 2

42 - 2 = E

40 = E

E = 40

Edges: 40

Answer 2

F + V = E + 2
F = 25
V = 17

25 + 17 = E + 2
42 = E + 2
42 - 2 = E
40 = E <== there are 40 edges