English: A unit cube (left) and a cube with volume 2 (right). Given the left figure, it is impossible to construct the right figure with compass and straightedge (see doubling the cube).
Français : Un cube de volume unitaire (gauche) et un cube de volume 2 (droite). A partir de la figure de gauche, il est impossible de contruire par les moyens géométriques traditionnels le cube de droite (voir Duplication du cube).
This image of simple geometry is ineligible for copyright and therefore in the public domain, because it consists entirely of information that is common property and contains no original authorship.
Heptagon
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