People used to measure the radius of nonplastic circular by the length of bowstrings in the geometric calculation .

在几何量量中弓高弦长等方法量非整形圆弧半。

In order to reduce the error in the calculation, this article raises a measure method to the radius of nonplastic circular arc which basis on the principle of geometry.

了降低量误差,提出了对非整形圆弧量的方法。