flexagon
mathematics
Quick Summary
A flexagon is a paper or foil figure that can change its faces when flexed. These geometric and topological recreations first gained attention in 1939.12
The simplest type is the trihexaflexagon, which is made from a strip of paper marked with 10 equilateral triangles. After folding and gluing, this model can be flexed to reveal different faces. The word "flexagon" combines "flex" with the suffix "-agon," similar to "hexagon".21
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