public double normalDistance(final double x,final double y,final double z){
  return Math.sqrt(normalDistanceSquared(x,y,z));
}

public double normalDistance ( final double x , final double y , final double z ) { return Math . sqrt ( normalDistanceSquared ( x , y , z ) ) ; }
compute the normal ( perpendicular ) distance to a vector described by a vector taken from the origin . monotonically increasing for arc distances up to pi / 2 .
