classic brain teaser - (rcareaga) - (5) - May 11, 2015, 02:29:42 PM EDT
         You shall have some pi! :) - (a6l6e6x) - May 11, 2015, 02:57:01 PM EDT
         and if you use the formular pi=r squared you could be sure the ribbon was long enough -NT - (boxley) - May 11, 2015, 03:21:19 PM EDT
         Re: classic brain teaser - (gcareaga) - (2) - May 11, 2015, 07:00:39 PM EDT
             20 second intervals -NT - (boxley) - May 11, 2015, 07:04:11 PM EDT
             The pearl probem - (rcareaga) - May 11, 2015, 08:32:29 PM EDT