An approach to extract feature points on the boundary based on length of arc is proposed in view of the key problem of measuring composite-shape parts.

针对组合形状零件几何尺寸测量中的关键问题—轮廓识别，提出了一种基于弧长的轮廓特征点提取的方法。

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The author analyzes the relationship between side and Angle in a diagram to deduce a new general-purpose formula which can determine the length of arc radius and the size of an ellipse.

文中通过分析图形中的边角关系，推导出确定椭圆大、小圆弧半径长度的通用计算公式。

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So, the next concept that I want to define is that of arc length.

接下来我想介绍一下弧长。

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He piggybacks this unit directly on top of a scope, allowing him to produce never-before-captured wide-field images, like his striking, ghostly picture of Barnard's Loop-a huge arc of gas that covers the length of the constellation Orion.

FORBES: A Star Is Born