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String girdling Earth is a mathematical puzzle with a counterintuitive solution. In a version of this puzzle, string is tightly wrapped around the equator of a perfectly spherical Earth. If the string should be raised 1 metre (3 ft 3 in) off the ground, all the way along the equator, how much longer would the string be?
Gardner, Martin (1994), "Hole in the Sphere", My best mathematical and logic puzzles, Dover Publications, p. 8 Jones, Samuel I. (1912), Mathematical Wrinkles for Teachers and Private Learners , Norwood, MA: J. B. Cushing Co. Problem 132 asks for the volume of a sphere with a cylindrical hole drilled through it, but does not note the invariance ...
String girdling Earth: Image title: Visualisation of the String girdling Earth puzzle showing that the length added to the circumference (cyan) is dependent only on the additional radius (red) and not the original circumference (black), by CMG Lee. Width: 100%: Height: 100%
String girdling Earth; T. Type in type; Type-in-type; V. Vanishing puzzle; Von Neumann paradox; Z. Zeno's paradoxes
User Androstachys (talk · contribs) seems to insist that this is a logic puzzle. As the essence of the puzzle is the circumference of the circle, this clearly is a mathematical puzzle, so I have undone the edit. DVdm 09:09, 23 August 2010 (UTC) User DVdm seems to think that there are puzzles that may be solved without using logic.
A complex Baguenaudier puzzle. The goal is to free the string. The "mini rope bridge puzzle". The goal is to remove the two rings. (solution shown). Wire-and-string puzzles usually consist of: one piece of string, ribbon or similar, which may form a closed loop or which may have other pieces like balls fixed to its end. one or several pieces of ...
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This is a list of puzzles that cannot be solved. An impossible puzzle is a puzzle that cannot be resolved, either due to lack of sufficient information, or any number of logical impossibilities. Kookrooster maken 23; 15 Puzzle – Slide fifteen numbered tiles into numerical order. It is impossible to solve in half of the starting positions.