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when toggle format what by license comment
Jan 30, 2011 at 17:42 history edited Bill Thurston CC BY-SA 2.5
made the circle description more precise.
Jan 30, 2011 at 3:03 comment added Joseph O'Rourke Thanks for the "barrel" intuition---It makes it evident!
Jan 30, 2011 at 2:52 history answered Bill Thurston CC BY-SA 2.5