Java Program to Find Number of Angles in N Sided Convex Polygon

import java.util.*;
public class Main
{
   public static void main(String[] args)
   {
    int n = 7;
    // formula to find the no. Of diagonals present in the polygon
    int diagonal =  n*(n-3)/2;      
    System.out.println("The no. Of diagonals present in the polygon is " + diagonal);
   }
}

Output:

The no. Of diagonals present in the polygon is 14