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18.4*26 这样的16K纸上，裁剪出圆锥的展开图
Author:
beaumath
圆锥展开，确定了侧面，相应的底面也变了，围城的圆锥可以由母线R，及侧面扇形的圆心角决定。
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圓周公式的應用
多邊形的面積
直線的斜率
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Irregular shape
切割任意四邊形再拼砌成矩形
畢氏定理2
正方体展开图的副本
圓錐截痕
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