這個好玩...鑽孔鑽出正方形
參考資料:
http://mathworld.wolfram.com/ReuleauxTriangle.html
http://whistleralley.com/ellipse/ellipse.htm
http://kmoddl.library.cornell.edu/tutorials/02/
http://whistleralley.com/reuleaux/reuleaux.htm
http://en.wikipedia.org/wiki/Curve_of_constant_width
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