SOLUTION: Find the number of diagonals for a polygon with N sides. IF N= 20

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Question 406771: Find the number of diagonals for a polygon with N sides. IF N= 20
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!


Hi

Note: # of Diagonals = n(n-3)/2

Recommend putting info like this on a 'condensed' fact sheet.

 n = 20

   20(17)/2 = 170