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I can't find the formula for the sides of a polygon vs. the total diagonals that it has! ex: 3 sided polygon, 0 diagonals, 4 sided, 2 diags, 5 s, 5 d, 6 s, 9 d, 7 s, 14 d 8 s, 20d, etc.

someone please tell me the formula

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