static double KhoangCach(DIEM pA, DIEM pB)
{
double dResult = 0;
dResult = Math.Sqrt(((pA.X - pB.X) * (pA.X - pB.X)) + ((pA.Y - pB.Y) * (pA.Y - pB.Y)));
return(dResult);
}
static void XuatDiem(DIEM pDiem)
{
Console.WriteLine("({0} , {1})", pDiem.X, pDiem.Y);
}