Soccer balls are usually covered with a design based on regular pentagons and hexagons.

How many pentagons/hexagons MUST there be, and why?

Soccer balls are usually covered with a design based on regular pentagons and hexagons....

A 2004 problem. Although the Adidas pattern remains a classic, since 2004 it has not been used in the premier soccer competition, the World Cup:

http://www.worldcupballs.info/world-cup-balls/1930-uruguay/1930-world-cup-ball-t-model.html

Posted by broll on 2016-04-16 02:38:46