The co-ordinates of the mid-point of CD is (1, 10)
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the points, A, C and D. Join them using straight lines to complete the square.
Hence B =(4,4).
The co-ordinates of the mid-pt of a segment joining (a,b) and (c,d) are ((a+c)/2,(b+d)/2).
Hence, mid point of CD =(1,10)