The Golden Rectangle [Le Rectangle d'Or].

See some related pictures (including this one):

On the left-hand side picture, the two rectangles (the big blue and the small red) are similar, hence:

                     phi        1
                    ----- = ---------
                      1      phi - 1
                    phi  = phi + 1

The positive root is the Golden Ratio (phi = (1+sqrt(5))/2 = 1,6180339887498949...).

[More information about related non periodical Penrose tilings -in english/en anglais-]
[Plus d'informations à propos des pavages non périodiques de Penrose associés -en français/in french-]

(CMAP28 WWW site: this page was created on 10/26/2016 and last updated on 08/22/2020 11:12:04 -CEST-)

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