[Here, we have x1 = 6, y1 = 1x2 = 9, y2 = 4]and the mid-point of the diagonal BD isHere, we have x1 = 8, y1 = 2x2 = p, y2 = 3]Since, the co-ordinates of the mid-point of AC = Co-ordinates of the mid point of BD.