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Facing the Soccer Ball

by Laura Overdeck

Have you ever wondered how many shapes a soccer ball has on it? It has 12 pentagons (5-sided shapes) and 20 hexagons (6-sided shapes). Each pentagon, usually black, has 5 white hexagons around it. It turns out there are only 5 ways to fit together lots of identical shapes with all equal sides. That’s why soccer balls need to “cheat” a bit by mixing hexagons with pentagons…but they’re much easier to kick across the field!

Wee ones: See if you can count how many sides a pentagon has (the black shapes on the ball shown here)!

Little kids: If you kick the ball and your foot touches a pentagon and all 5 hexagons touching it, how many shapes did your foot touch?  Bonus: If you touched just that 1 pentagon, how many of the 12 pentagons did you *not* touch?

Big kids: Since the ball has 20 hexagons and 12 pentagons, how many faces does it have in total?  Bonus: If you can bounce the ball 13 times on your knee and then twice as many times off your foot, how many times in a row can you bounce the ball in the air?

The sky’s the limit: When someone makes a soccer ball, each shape edge is sewn together with another shape’s edge. How many of those lines does the maker sew in total? (Hint if needed: Every shape edge is shared with 1 other shape…)

 

 

 

Answers:
Wee ones: 5 sides.

Little kids: 6 shapes.  Bonus: 11 pentagons.

Big kids: 32 faces.  Bonus: 39 times (13 + 26).

The sky’s the limit: 90 lines. The 20 hexagons have 6 edges apiece, giving us 120 edges in total, while the 12 pentagons have 5 edges each, or 60 in total. That gives us 180 edges that need to meet up with each other. Each one takes another one away from the pile, so there are 90 pairs.

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