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 Description  
 Distance:  The amount of space between two points or things. Distance is always a non-negative number.
If you know the coordinates of the 2 points, you can find the distance between the points by using the distance formula. Let's say the coordinates of the two points P and Q are (a, b) and (c, d).



Then the distance formula is:



Look at two points on a coordinate plane. Can you tell how the Pythagorean Theorem is related to the distance formula?