This applet illustrates the distance between 2 points in three-dimensions. The two points A and B can be moved in the 3D view. When the point shows a four arrow cross it can be moved parallel to the x-y plane. Two opposite arrows allow point movement parallel to the z axis. Change the movement mode by selecting the point.[br]The left view shows the coordinates of the points as (x,y,z) arrays. The distance in each coordinate direction is then shown as [math]\Delta x,\Delta y,\Delta z[/math]. Then the length is calculated from the 3D Pythagorean theorem.[br]An additional value of the unit vector which indicates the direction of the vector by dividing the coordinate distances by the total length is also shown.[br][br]Two check boxes allow you to display the coordinate path from A to B and the unit vector in the three dimensional view.