//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))); }