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A tangent, in geometry, is a straight line through a point on a curve that has the same direction at that point as the curve. Tangent may also refer to: == Mathematics == *Analogous concepts for surfaces and higher-dimensional smooth manifolds, such as the tangent space * *More generally, in geometry, two curves are said to be tangent when they intersect at a given point and have the same direction at that point; see for instance tangent circles * *Bitangent, a line that is tangent to two different curves, or tangent twice to the same curve *The tangent function, one of the six basic trigonometric functions 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「Tangent (disambiguation)」の詳細全文を読む スポンサード リンク
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