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

public double linearDistance ( final double x , final double y , final double z ) { return Math . sqrt ( linearDistanceSquared ( x , y , z ) ) ; }
compute the straight - line distance to a point described by the vector taken from the origin . monotonically increasing for arc distances up to pi .
