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  2. Missing square puzzle - Wikipedia

    en.wikipedia.org/wiki/Missing_square_puzzle

    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.

  3. Tangram - Wikipedia

    en.wikipedia.org/wiki/Tangram

    The tangram (Chinese: 七巧板; pinyin: qīqiǎobǎn; lit. 'seven boards of skill') is a dissection puzzle consisting of seven flat polygons, called tans, which are put together to form shapes. The objective is to replicate a pattern (given only an outline) generally found in a puzzle book using all seven pieces without overlap.

  4. Tetrad (geometry puzzle) - Wikipedia

    en.wikipedia.org/wiki/Tetrad_(geometry_puzzle)

    In geometry, a tetrad is a set of four simply connected disjoint planar regions in the plane, each pair sharing a finite portion of common boundary. It was named by Michael R. W. Buckley in 1975 in the Journal of Recreational Mathematics.

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  6. These 3D Brain Teaser Puzzles Require Logic and Geometry for ...

    www.aol.com/lifestyle/3d-brain-teaser-puzzles...

    Multi-piece puzzles are either lock-based (which involve pulling apart and putting together geometric shapes via turning, clicking, maneuvering, or shimmying each piece) or spatial (which involve ...

  7. Dissection puzzle - Wikipedia

    en.wikipedia.org/wiki/Dissection_puzzle

    Some types of dissection puzzle are intended to create a large number of different geometric shapes. The tangram is a popular dissection puzzle of this type. The seven pieces can be configured into one of a few home shapes, such as the large square and rectangle that the pieces are often stored in, to any number of smaller squares, triangles, parallelograms, or esoteric shapes and figures.

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