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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?
Suppose the radius of the sphere is and the length of the cylinder (or the tunnel) is .. By the Pythagorean theorem, the radius of the cylinder is . Finding the measurements of the ring that is the horizontal cross-section.
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%
I.m.o. logic doesn't affect the intrinsic mathematics of the puzzle, which is the fact that the circumference of a circle is 2 Pi times the radius. That is the essence of the puzzle. Ask any mathematician or logician whether this is a logic puzzle or a mathematics puzzle. The essence of the matter is a geometric property, not a logical one.
Puzzle Quest 3 was developed by Infinity Plus 2 and published by 505 Games for release on Microsoft Windows and iOS and Android devices on March 1, 2022. [3] An early access form for Android was first released on March 26, 2021. [4] [5] Puzzle Quest 3 is a direct follow up of Puzzle Quest: Challenge of the Warlords. [6]
The percentage advantage earned from haggling can be used as a discount on a single purchase, or as a bonus on the sale of a single part or ship. This puzzle becomes available after Pezt joins the player's crew. [3] Gathering Rumours: This puzzle becomes available after Elgara joins the player's crew. The goal of these puzzles is to survive a ...
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 ...
15 Puzzle – Slide fifteen numbered tiles into numerical order. It is impossible to solve in half of the starting positions. [1] Five room puzzle – Cross each wall of a diagram exactly once with a continuous line. [2] MU puzzle – Transform the string MI to MU according to a set of rules. [3]