Diagonal of a Polygon

Diagonal of a Polygon

Line segment that joins two nonconsecutive vertices of a polygon.


Segments AC and AD are diagonals of the pentagon ABCDE.


  • A triangle does not have a diagonal.
  • To calculate the number \(N\) of diagonals of a polygon with n sommets, vertices, you can use the formula:  \(N=\dfrac{n(n\space –\space 3)}{2}\).

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