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A flat ball? (Posted on 2004-04-08) Difficulty: 2 of 5
Soccer balls are usually covered with a design based on regular pentagons and hexagons.

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

See The Solution Submitted by Federico Kereki    
Rating: 3.7500 (4 votes)

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Some Thoughts So far, no cigar... | Comment 9 of 24 |
Up to now, answers have been based on inspection, but no one gave a reason for those numbers -- if they are correct, that is!
  Posted by Federico Kereki on 2004-04-09 18:51:00
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