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单词 Tangent Line
释义

Tangent Line

英语百科

Tangent

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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更新时间:2025/6/24 0:42:55