The formula is: 0.5*(n2-3n) = diagonals whereas n is the number of sides of the polygon
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14 diagonals
The five sided Polygon has 5 diagonals
A polygon with 14 diagonals will have 7 sides
The diagonals (drawn from a point) help in dividing the regular polygon into smaller triangles. The sum of the areas of these smaller triangles help in determining the total area of the polygon.
The formula for the number of diagonals is: 0.5*(n^2-3n) whereas 'n' is the number of sides of the polygon