出典:Wiktionary
From Latin parallēlepipedum, from Ancient Greek παραλληλεπίπεδος (parallēlepípedos, “with parallel surfaces”), from παράλληλος (parállēlos, “parallel”) + ἐπίπεδος (epípedos, “plane”).
parallelepiped (複数形 parallelepipeds)
出典:Wikipedia
出典:『Wikipedia』 (2011/06/01 00:18 UTC 版)
In geometry, a parallelepiped is a three-dimensional figure formed by six parallelograms. (The term rhomboid is also sometimes used with this meaning.) By analogy, it relates to a parallelogram just as a cube relates to a square. In Euclidean geometry, its definition encompasses all four concepts (i.e., parallelepiped, parallelogram, cube, and square). In this context of affine geometry, in which angles are not differentiated, its definition admits only parallelograms and parallelepipeds. Three equivalent definitions of parallelepiped are
evolution and involution
平行線.
the horizontal axis
quarter-binding
quarter-binding
the perpendicular plane
垂直離陸.
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