code: @Pure
  	public Plane3D<?> getPlane() {
  		return toPlane(
  				getX1(), getY1(), getZ1(),
  				getX1(), getY1(), getZ1(),
  				getX1(), getY1(), getZ1());
  	}
docs: Replies the plane on which this triangle is coplanar.
  
  @return the coplanar plane to this triangle