The formula is: 0.5*(n2-3n) where n is the number of sides of the polygon
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The five sided Polygon has 5 diagonals
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0.5*(n2-3n) where n is equal to the number of sides of the polygon
You can use the formula D=S-2 where D is the number of possible diagonals and S is the number of sides the polygon has.
The formula is: 0.5*(n2-3n) = diagonals whereas n is the number of sides of the polygon