for (i = 0; i < n - 1; i++)
            {
                for (j = 0; j < n - 1; j++)
                {
                    if (i == j)
                        continue;
                    for (k = 0; k < n - 1; k++)
                    {
                        if ((i == k) || (j == k))
                            continue;
                        a = Math.Abs(x[i] - x[k]);
                        b = Math.Abs(x[j] - x[n]);
                        c = Math.Sqrt((x[j] - x[i]) * (x[j] - x[i]) + (y[j] - y[i]) * (y[j] - y[i]));
                        d = Math.Sqrt((x[n] - x[k]) * (x[n] - x[k]) + (y[n] - y[k]) * (y[n] - y[k]));