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词汇 Point of tangency
分类 英语词汇 英语翻译词典
释义

Point of tangency

中文百科

切线 Tangent

（重定向自Point of tangency）
Tangent plane to a sphere
A tangent, a chord, and a secant to a circle
At each point, the moving line is always tangent to the curve. Its slope is the derivative; green marks positive derivative, red marks negative derivative and black marks zero derivative. The point (0, 0) is not a max, or a min, but is a point of inflection.

切线（拉丁语：tangent line），为一几何名词，使用于曲线及平面圆时意义有所不同。

设L为一条曲线，A,B为此曲线上的点，过此二点作曲线的割线，令B趋向A，如果割线的极限存在，则称此极限（一条直线）为曲线在A的切线。

英语百科

Tangent 切线

（重定向自Point of tangency）
Tangent to a curve. The red line is tangential to the curve at the point marked by a red dot.
Tangent plane to a sphere
A tangent, a chord, and a secant to a circle
At each point, the moving line is always tangent to the curve. Its slope is the derivative; green marks positive derivative, red marks negative derivative and black marks zero derivative. The point (0, 0) is not a max, or a min, but is a point of inflection.

In geometry, the tangent line (or simply tangent) to a plane curve at a given point is the straight line that "just touches" the curve at that point. Leibniz defined it as the line through a pair of infinitely close points on the curve. More precisely, a straight line is said to be a tangent of a curve y = f (x) at a point x = c on the curve if the line passes through the point (c, f (c)) on the curve and has slope f '(c) where f ' is the derivative of f. A similar definition applies to space curves and curves in n-dimensional Euclidean space.
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