This paper discusses the method of using rulers and compasses to average the polygonal areas by treating the dot on the bounder of a polygonalarea as a beeline.
讨论尺规方法均分多边形面积,给出过多边形边界上一点作一直线将多边形面积二等分的作法。
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Step 11: Next, create a new layer "shadow" and use the Polygonal Lasso Tool (L) to create a shadow area.