Fortune Telling Collection - Free divination - Coin paradox
Coin paradox
Read the question carefully, draw a picture of "the coin above rotates half a circle around the coin below", and mark the distance traveled by the center of the circle as A.
Then draw a picture of "coins that walk half a circle" according to the topic, and mark the path B that the center of the circle has traveled.
Comparing A and B, we can easily find that a=2b.
That is to say, "the coin on the top turns half a circle around the coin on the bottom" is not a coin on the topic at all, but actually a circle! ! ! ! It's just people's mindset that coins turn half a turn.
When I was in the third grade, my teacher talked about a similar problem, and I got a formula to find the distance that a coin goes around the center of another coin. . . . (But I forgot)
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