In geometry, the napkin-ring problem involves finding the volume of a "band" of specified height around a sphere (i.e., the part that remains after a hole in the shape of a circular cylinder is drilled through the center of the sphere). It is a counterintuitive fact that this volume does not depend on the original sphere's radius but only on the resulting band's height. The problem is so called because after removing a cylinder from the sphere, the remaining band resembles the shape of a napkin ring.

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• In geometry, the napkin-ring problem involves finding the volume of a "band" of specified height around a sphere (i.e., the part that remains after a hole in the shape of a circular cylinder is drilled through the center of the sphere). It is a counterintuitive fact that this volume does not depend on the original sphere's radius but only on the resulting band's height. The problem is so called because after removing a cylinder from the sphere, the remaining band resembles the shape of a napkin ring. (en)
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• 21693427 (xsd:integer)
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• Spherical Ring
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• SphericalRing
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• In geometry, the napkin-ring problem involves finding the volume of a "band" of specified height around a sphere (i.e., the part that remains after a hole in the shape of a circular cylinder is drilled through the center of the sphere). It is a counterintuitive fact that this volume does not depend on the original sphere's radius but only on the resulting band's height. The problem is so called because after removing a cylinder from the sphere, the remaining band resembles the shape of a napkin ring. (en)
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• Napkin ring problem (en)
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