Daca D este mijlocul segmentului AB => D ( xA+xB /2 ; yA+yB / 2)
D ( 2-1 /2 ; 4+3 /2 )
D ( 1/2 ; 7/2 )
Coordonatele vectorului CD sunt (xD-xC) i(vector) + (yD-yC)j (vector)
CD(vector) = (1/2 - 5)i(vector) + (7/2-1)j(vector)
CD(vector)= -9/2 i(vector) + 5/2 j(vector)