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並前往https://www.quora.com/If-is-a-polygon-with-n-sides-has-1-2*n*n-3-diagonals-how-many-sides-will-a-polygon-have-with-65-diagonals-Is-there-a-polygon-with-50-diagonals

If is a polygon with n sides has 1/2*n*n-3 diagonals ... - Quora

The number of diagonals of a polygon is given by n(n-3)/2. So if there are 65 diagonals then the number of sides of the polygon are 65*2 = 130 = n(n-3), ...

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