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tan·gent /-ʤənt/

(a.)接觸的,切線的,相切的,離題的切線,正切

tangent

正

From: Network Terminology

tangent

正切 切線

Tan·gent n. Geom. A tangent line curve, or surface; specifically, that portion of the straight line tangent to a curve that is between the point of tangency and a given line, the given line being, for example, the axis of abscissas, or a radius of a circle produced. See Trigonometrical function, under Function.

**Artificial tangent**, *or* **Logarithmic tangent**, the logarithm of the natural tangent of an arc.

**Natural tangent**, a decimal expressing the length of the tangent of an arc, the radius being reckoned unity.

**Tangent galvanometer** Elec., a form of galvanometer having a circular coil and a short needle, in which the tangent of the angle of deflection of the needle is proportional to the strength of the current.

**Tangent of an angle**, the natural tangent of the arc subtending or measuring the angle.

**Tangent of an arc**, a right line, as *ta*, touching the arc of a circle at one extremity *a*, and terminated by a line *ct*, passing from the center through the other extremity *o*.

Tan·gent, a. Touching; touching at a single point; specifically Geom. meeting a curve or surface at a point and having at that point the same direction as the curve or surface; -- said of a straight line, curve, or surface; as, a line tangent to a curve; a curve tangent to a surface; tangent surfaces.

**Tangent plane** Geom., a plane which touches a surface in a point or line.

**Tangent scale** Gun., a kind of breech sight for a cannon.

**Tangent screw** Mach., an endless screw; a worm.

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From: WordNet (r) 2.0

tangent

n 1: a straight line or plane that touches a curve or curved

surface at a point but does not intersect it at that

point

2: ratio of the opposite to the adjacent side of a right-angled

triangle [syn: tan]