I don't understand. Please, help
How many diagonals are there in a polygon with 9 sides?
The answer is 36

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https://www.mathsisfun.com/geometry/polygons-diagonals.html

However, with the formula \(\dfrac{n(n-3)}{2}\) we get \(dfrac{9(9-3)}{2}=27\) :(

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