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

在几何量量以弓高弦长等方法量非整形圆弧半径。

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.

降低量误差,提出对非整形圆弧径量的方法。