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.

youdao

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.

youdao