Question 203131
Since the diagonals of a parallelogram bisect each other so we only have to find the midpoint of either diagonal. Using the Midpoint Formula ( {{{(x[1] + x[2])/2}}} , {{{(y[1] + y[2])/2}}} ):
( (1+0)/2 , (3 + (-3))/2) ) = (1/2, 0)
or
( (4 + (-3))/2 + (1 + (-1))/2 ) = (1/2, 0)