//thanh phan xu ly
public TAMGIAC(DIEM a, DIEM b, DIEM c)
{
this.A = a;
this.B = b;
this.C = c;
}
public double KhoangCach2Diem(DIEM b)
{
return(Math.Sqrt((this.X - b.X) * (this.X - b.X) + (this.Y - b.Y) * (this.Y - b.Y)));
}
