What's the paradox?
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I think it's that the circumferences of the two coins are the same so you'd expect rolling all the way round to make one rotation
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The coin has revolved but also translated so the point of contact has only made half of a full rotation
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The solution is
#bitcoin
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One full rotation = πd. Coin's path around other coin makes a bigger circle with circumference = 2πd. ∴ Half of this path 2πd/2 is enough.
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The solution is that the rotation axis of the coin is not in the center of the coin.
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[breaks bottle, grabs barstool]
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The center of the moving coin travels a circumference.
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