Line segment that joins two nonconsecutive vertices of a polygon.
Example
Segments AC and AD are diagonals of the pentagon ABCDE.
Properties
- 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: \(N=\dfrac{n(n\space –\space 3)}{2}\).