median
don steward
mathematics teaching 10 ~ 16
Saturday, 26 March 2011
ring alignments
if you have a ring of regular pentagons
it takes 10 to complete a full loop
why is that?
if you have a ring of regular decagons
it also takes 10 to complete a loop
why is that?
then one seems to fit snugly inside the other
how come they align so neatly?
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