Midpoint of a Line Segment
CoordinatesWe will be using Cartesian Coordinates,
where we mark 

Example: The point (12,5) is 12 units along, and 5 units up 
Midpoint of a Line Segment
The midpoint is halfway between two points. So all we have to do is ... ... calculate the average x and average y of the two end points:

And this is what you get:
M = (  x_{A}+x_{B}  ,  y_{A}+y_{B}  ) 
2  2 
Example: What is the midpoint here?
M = ( 5/2, 4/2 ) M = ( 2.5, 2 ) 