public class Triangle {
  public Position p1;
  public Position p2;
  public Position p3;

  public Triangle() {
    p1 = new Position();
    p2 = new Position();
    p3 = new Position();
  }

  public Triangle(Position p1,Position p2,Position p3) {
    this.p1 = new Position(p1);
    this.p2 = new Position(p2);
    this.p3 = new Position(p3);
  }

  public Triangle(Triangle t) {
    p1 = new Position(t.p1);
    p2 = new Position(t.p2);
    p3 = new Position(t.p3);
  }
  
  public Direction normale() {
    Direction v1 = new Direction(p3,p1);
    Direction v2 = new Direction(p3,p2);
    Direction n = v1.produitVectoriel(v2);
    n.normalise();
    return(n);
  }
  
  public String toString() {
    return("["+p1+",\n "+p2+",\n "+p3+"]");
  }
}