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- Napkin ring problem
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Japanese
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geometry
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International Standard Book Number
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Pythagorean theorem
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sphere
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chord
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parallelism
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George Pólya
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Martin Gardner
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MathWorld
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annulus
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Takakazu Seki
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cross section
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Eric W. Weisstein
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spherical cap
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Cavalieri's principle
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Keith Devlin
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Mathematical Association of America
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Japanese mathematics
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David Eugene Smith
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