Hint to Riddle #72: Length of Rope Around a Rod?

72. A string is wound symmetrically around a circular rod. The string goes exactly 4 times around the rod. The circumference of the rod is 4cm and it's length is 12cm.

Find the length of the string.
a 12cm pipe with a string wrapped around it I'm just going to leave this diagram here without comment. Should be all the clue you need. a 12cm pipe cut flat


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