[list=1][*]5 units[/*][*]5 units[/*][*]2 units[/*][*]8 units[/*][/list]When these points are moved around on the graph, they form horizontal and vertical line segments. The length of these can be determined by counting the unit squares between the points.[br][br]

[list=1][*]This time the distance is not just horizontal or vertical, it's both. In other words, this is a diagonal distance.[/*][*]This distance can't be found by counting, because it doesn't line up perfectly with the unit squares, but it can be found in other ways.[br][br][/*][/list]