Calculate the midpoint of a segment defined by two points

Action
X coordinates of points A 
Y coordinates of points A 
X coordinates of points B 
Y coordinates of points B 
Description (-)
Calculate the midpoint of a segment defined by two points A(Xa , Ya) and B(Xb,Yb). The midpoint is a point whose x and y coordinates are given by 

X coordinate of Midpoint= (Xa+Xb) / 2 
Y coordinate of Midpoint= (Ya+Yb) / 2
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