If it has 28 sides then it has 350 diagonals by using the formula 0.5(n^2 -3n) whereas 'n' means number of sides
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The five sided Polygon has 5 diagonals
209
It is: 0.5*(144-36) = 54 diagonals
The formula is: 0.5*(n2-3n) = diagonals whereas n is the number of sides of the polygon
65