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

1.在几何量量中一直以弓高方法量非弧半径值。

2.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.

2.为了降低量误差,提出了对非弧直径量的方法。