January 3, 2012
Rolling Balls and Circles
John Baez
There's a lot of beautiful math lurking in rolling circles and balls!

Part 1  Rolling a circle on a circle that's the same size.

Part 2  Rolling a circle on a circle that's twice as big.

Part 3  Rolling a circle inside a circle that's 2,3, or 4 times as big.

Part 4  Rolling a ball on a ball that's 3 times as big: warmup.

Part 5  Rolling a ball on a ball that's 3 times as big: conclusion.

Part 6  Summary, with a cool animation.
© 2012 John Baez
baez@math.removethis.ucr.andthis.edu
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