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The number of diagonals in a certain regular polygon is equal to $2$ times the number of sides.  How many sides does this polygon have?

 Dec 7, 2023
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So basically is there are x sides, there will be x*(x-1)/2 - x diagonals, and if 2x = x*(x-1)/2 - x, then x must equal to 7, septagon. Go on, try it! 

 Dec 8, 2023

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