教学中用定积分求曲线弧长的改进

摘要

This paper directly derives the curve arc length formula from the definition of smooth curve arc length.Ideas about approximating the arc length with tangent line have changed to get the arc length formula of smooth curve before.%本文利用光滑曲线弧长定义直接推导出求曲线弧长公式,改变了以往以切线近似代替弧长导出求曲线弧长公式的思想.