两点间距离公式

1

本文根据圆的渐开线原理和两点间的距离公式，得出两种用放射式丈量法测画不分道跑起跑线的新画法。

This article utilizes the theory of involute of circle and the formula of the distance between two points to obtain two radiated measurement ways of defining the starting line .
2

利用向量相等概念，只要已知起点、终点坐标即可求出向量的模，就可推证出两点间的距离公式；

With the concept of vector equality , if coordinates of starting point and terminal point are provided , both mold of vector and distance formula between two points can be worked out .
3

本文研究了凸域内两点间的平均距离公式，利用广义支持函数的方法分别求出了圆、矩形、椭圆域内两点间的平均距离，并给出了具体的求解过程。

Using a universal formula for the mean length of a convex set and the generalized support function , this paper has arrived at the mean length of the ellipse .