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Old 07-24-2007   #6
ebayberto
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the number of diagonals is determined by the equation n(n-3)/2 where n equals the number of sides.. then in your problem, we will be having an equation;n(n-3)/2 - n = 0n(n-3) - 2n=0n^2 - 5n = 0n=5there are 5 sides.