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In mathematics, a hyperboloid is a quadric – a type of surface in three dimensions – described by the equation : (hyperboloid of one sheet), or : (hyperboloid of two sheets). Both of these surfaces asymptote to the same conical surface as x or y become large: : These are also called elliptical hyperboloids. If and only if ''a'' = ''b'', it is a hyperboloid of revolution, and is also called a circular hyperboloid. == Cartesian coordinates == Cartesian coordinates for the hyperboloids can be defined, similar to spherical coordinates, keeping the azimuth angle , but changing inclination ''v'' into hyperbolic trigonometric functions: One-surface hyperboloid: : : : Two-surface hyperboloid: : : : 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「Hyperboloid」の詳細全文を読む スポンサード リンク
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