Tangent
01
切线, 切線
a straight line that touches a curve or surface at exactly one point, known as the point of tangency
例子
In geometry class, we learned how to draw a tangent to a circle, ensuring it only touched the circle at a single point.
在几何课上，我们学习了如何画一个圆的切线，确保它只在一点接触圆。
02
正切, 切线
(mathematics) the ratio of the opposite to the adjacent side of a triangle that has one angle of 90°
例子
If the tangent of an angle is 1, it means the height and base of our triangle are the same.
如果一个角的切线是1，这意味着我们三角形的高度和底边是相同的。
