SOLUTION: The number of diagonal in a six sided figure are

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Question 1142898: The number of diagonal in a six sided figure are
Answer by ikleyn(52832) About Me  (Show Source):
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The number of  highlight%28cross%28diagonal%29%29  diagonals  in a six sided  highlight%28cross%28figure%29%29  convex polygon  highlight%28cross%28are%29%29  is 

     %286%2A%286-3%29%29%2F2 = %286%2A3%29%2F2 = 18%2F2 = 9.     ANSWER