Algebra - Ch. 26: Solving Problems with Quadratic Equations (6 of 11) Find diagonals in Polygon Ex.6

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We will find the number of the sides of the polygon if the polygon has 35 diagonal, given
N=(n^2-3n)/2 where N=number of diagonal, n=number of sides.

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[NormanStJames]

Thank you I have tried for years just now getting it

[anilsharma-evmy]

In a triangle every side is diagonal for other two sides 😝😝😝