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・ Torodora octavana
・ Torodora ortilege
・ Torodora parthenopis
・ Torodora pseudogalera
・ Torodora rectilinea
・ Torodora rectivalvata
・ Torodora sciadosa
・ Torodora spinula
・ Torodora styloidea
・ Torodora vietnamensis
・ Torodorinae
・ Torofluxus
・ Torog (Dungeons & Dragons)
・ Torogan
・ Toroglej River
Toroid
・ Toroid Terror
・ Toroidal
・ Toroidal and poloidal
・ Toroidal coordinates
・ Toroidal expansion joint
・ Toroidal Fusion Core Experiment
・ Toroidal graph
・ Toroidal inductors and transformers
・ Toroidal moment
・ Toroidal polyhedron
・ Toroidal reflector
・ Toroidal ring model
・ Toroidh
・ Torok Formation


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Toroid : ウィキペディア英語版
Toroid

In mathematics, a toroid is a surface of revolution with a hole in, like a doughnut. The axis of revolution passes through the hole and so does not intersect the surface. For example when a rectangle is rotated around an axis parallel to one of its edges, then a hollow square-section ring is produced. If the revolved figure is a circle, then the object is called a torus.
The term "toroid" Is also used to describe a toroidal polyhedron. In this context a toroid need not be circular and may have any number of holes.〔Stewart, B.; "Adventures Among the Toroids:A Study of Orientable Polyhedra with Regular Faces", 2nd Edition, Stewart (1980).〕
== See also ==

*Annulus

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「Toroid」の詳細全文を読む



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