trihexaflexagon

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construction

  • Square numbers shown formed from consecutive triangular numbers
    In number game: Flexagons

    …the simplest flexagons is the trihexaflexagon, made by cutting a strip of suitable material and marking off 10 equilateral triangles. By folding appropriately several times and then gluing the last triangle onto the reverse side of the first triangle, the resulting model may be flexed so that one of the…

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