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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: Johnson solids | Comment 21 of 25 |
(In reply to Johnson solids by Jer)

I beg to differ.  Even a non-convex shape is still topologically equivalent to a sphere, just like the platonic solids, a soccer ball, or similar shapes.  (The point being that there are no holes in the surface.)

  Posted by Thalamus on 2004-04-15 12:32:08

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