This paper puts forward some practical formulae of measuring the area and arc length of arch form, and analyses the relative error of these formulae.
文章提出弓形面积和弧长计量的实用公式，并分析了该公式的相对误差。
This paper puts forward some practical formulae of measuring the area and arc length of arch form, and analyses the relative error of these formulae.
文章提出弓形面积和弧长计量的实用公式，并分析了该公式的相对误差。
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