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The missing square puzzle is an optical illusion used in mathematics classes to help students reason about geometrical figures; or rather to teach them not to reason using figures, but to use only textual descriptions and the axioms of geometry. It depicts two arrangements made of similar shapes in slightly different configurations.
Original – The missing square puzzle is an optical illusion used in mathematics classes to help students reason about geometrical figures. It depicts two arrangements of shapes, each of which apparently forms a 13×5 right-angled triangle, but one of which has a 1×1 hole in it. Reason
Date/Time Thumbnail Dimensions User Comment; current: 06:08, 21 January 2023: 512 × 683 (444 bytes): Cmglee: Swap figures so missing square is below: 07:11, 20 January 2023
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Interactive SVG of The Disappearing Bicyclist – in the SVG file, move the pointer to rotate the disc. A vanishing puzzle is a mechanical optical illusion comprising multiple pieces which can be rearranged to show different versions of a picture depicting several objects, the number of which depending on the arrangement of the pieces.
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Mathnet is a pastiche of Dragnet, in which the main characters are mathematicians who use their mathematical skills to solve various crimes and mysteries in the city, usually thefts, burglaries, frauds, and kidnappings.