Distance
Distance is the length of units between two specific points. You find distance by using the following formula:
Distance Formula
This is an example of how you would use the distance formula to find the distance from the points (1,1), and (1,5).
What is the Distance between point (1,2) and point (-1, -2)?
Create a line segment, using the the point tools, create two points, an then join them using the line segment tool. Use the distance tool, clicking point A first, and then point B second. (The titles of the dots will appear once the distance shows up. It does not matter the order you click the points.)