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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)

Comments: ( Back to comment list | You must be logged in to post comments.)
re(2): Hint in the title? | Comment 8 of 24 |
(In reply to re: Hint in the title? by Brian Wainscott)

That's so neat.

How would one show the angle deficit is always 720 degrees.
I've never noticed this but I'm sure its been proven.


ps. The preview button is right next to the post button in my browser (I.E.)
  Posted by Jer on 2004-04-09 14:10:40

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