affine length of an arc

例句：

1. 1. Theaffine length of the curve is crucial for determining its curvature.
   曲线的仿射长度对于确定其曲率至关重要。
2. 2.The arcus length of the circle is π (pi).
   圆的圆弧长度是π。
3. 3. In geometry, the affine length is used to measure the distance between two points on a curve.
   在几何学中，仿射长度用于测量曲线上两点之间的距离。