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.
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。
By using the generalized support function, we reckon the mean distance of two points of circle, rectangle and ellipse, and deduct the idiographic process.
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