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number of diagonals in an n-sided polygon is n(n-1)/2 - n

If the polygon has 12 sides, number of diagonals is 12(12-1)/2 -12

= (12)(11)/2 -12

= 132/2 - 12

= 66-12 = 54

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Q: How many diagonals would a 12-sided n-sided figure have?
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