public Triangle() { begin = new Diem(0, 0); momo = new Diem(0, 0); end = new Diem(0, 0); }
public Line() { begin = new Diem(0, 0); end = new Diem(0, 0); }
public Line(Diem A, Diem B) { begin = A; end = B; }
public Triangle(Diem A, Diem B, Diem C) { begin = A; end = B; momo = C; }