A construction for line segments,with lengths equal to the square root of the integers
√(1²+1²) = √2
√((√2)²+1²) = √3
√((√3)²+1²) = √4
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credits: https://commons.wikimedia.org/wiki/File:Rooty-helix.svg
approfond
me l'ha fatta conoscere Andrea.
Ho trovato questa bella immagine.