1. People used to measure the radius of nonplastic circular by the length of bowstrings in the geometric calculation .
   在几何量测量中一直以弓高弦长等方法测量非整形圆弧半径值。
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.
   为了降低测量误差,提出了对非整形圆弧直径测量的方法。

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