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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