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

在何量量中一直以弓高弦长等方法量非整形圆弧半径值。

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.

为了降低量,出了对非整形圆弧直径量的方法。