code: public static float distance(float x1, float y1, float x2, float y2) {
          return (float) Math.sqrt(distanceSquared(x1, y1, x2, y2));
      }
docs: Return the distance between <code>(x1, y1)</code> and <code>(x2, y2)</code>.
  
  @param x1
  the x component of the first vector
  @param y1
  the y component of the first vector
  @param x2
  the x component of the second vector
  @param y2
  the y component of the second vector
  @return the euclidean distance