形的外角
The outer Angle of the shape
以上为机器翻译结果，长、整句建议使用 人工翻译 。
利用多边形外角定理的推广，判断偏置后曲线多边形的旋向，删除多余多边形。
Utilizing the extension of the polygon exterior angle sum theorem, directions of curvilinear polygons were judged and redundant polygons were deleted.
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