常看到有人问纸杯的做法，今天抽了些时间自己做一下，如果找不到纸杯的刀模，还是直接“尺规作图”吧：
1、先定好你的杯口尺寸及杯底尺寸、杯高度（可拿纸杯参考），画三条直线排成“工”并水平居中对齐，分别为杯口直径、杯底直径及高度；
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2、将垂直线向下延长，再连接上下两条线的端点并以右上角为参考点缩放延长路径与垂直线相交；
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3、用剪刀工具在相交处剪开，删除多余路径；
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4、删除垂直线段，并新绘制一条线段连接相交点与杯底的一锚点；
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5、用旋转工具以相交点为参考点旋转两条线段向两边为水平线段（借助智能参考）
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6、再分别以这两条线段为半径，相交点为圆心绘制两个正圆；
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7、用计算器算出“杯口直径÷大圆直径×360”得出扇形的角度，然后将长的线段按这个角度旋转复制一条；
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8、将两条长的线段与两个圆选中，进行分割（可适当延长线段以利于分割）；
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9、删掉多余的扇形，用旋转工具旋转成水平放置；
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10、最后得到纸杯的扇 形，你也可以偏移路径来做出血，杯上的图案可以复制扇形的一段弧，然后偏路径来，再为路径加画笔来做。
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