1/2*(1002-300) = 4850 diagonals
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9 diagonals
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.
An octagon has 16 diagonals.
Four sided quadrilaterals have two diagonals.
0.5*(82-24) = 20 diagonals