Diagonals in Polygon

By: adarshsojitra on 15:30

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#include<stdio.h>
#include<conio.h>
main()
{
        long n,ans;
        clrscr();
        printf("Enter the sides of polygon: ");
        scanf("%ld",&n);
        ans=((n*n)-(3*n))/2;
        printf("\nNumber of diagonals is %ld",ans);
        getch();
}