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Shapes of constant width

Author:
Michael Borcherds
Topic:
Circle, Square
A circle is a shape with constant radius. This shape has a constant diameter. This idea can be used to drill (almost) square holes and make coins which work in slot machines. http://www.cut-the-knot.org/do_you_know/cwidth.shtml http://web.mat.bham.ac.uk/C.J.Sangwin/howroundcom/roundness/applications.html

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