A soccer ball is a polyhedron made from 20 regular hexagons and 12 regular pentagons. It has 60 verticies. ...

Question

Determine the number of edges on a soccer ball.

Answer 1

The hexagons have 20 x 6 = 120 sides.
The pentagons have 12 x 5 = 60 sides.
That's a total of 180 sides.
Each edge of the soccer ball includes two sides:
So you have 180/2 or 90 edges.

Interesting to note that there's a chemical compound that's shaped exactly like a soccer ball. It's called Buckminster Fullerene.

http://en.wikipedia.org/wiki/Buckminster_Fullerene#Buckminsterfullerene

Answer 2

90 edges