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Coin Paradox

المؤلف:  Pappas, T.

المصدر:  "The Coin Paradox." The Joy of Mathematics. San Carlos, CA: Wide World Publ./Tetra

الجزء والصفحة:  ...

14-2-2022

1870

Coin Paradox

 

After a half rotation of the coin on the left around the central coin (of the same radius), the coin undergoes a complete rotation. In other words, a coin makes two complete rotations when rolled around the boundary of an identical coin. This fact is readily apparent in the generation of the cardioid as one disk rolling on another.

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REFERENCES

Pappas, T. "The Coin Paradox." The Joy of Mathematics. San Carlos, CA: Wide World Publ./Tetra, p. 220, 1989.

Steinhaus, H. Mathematical Snapshots, 3rd ed. New York: Dover, p. 145, 1999.