Ans is (b, a)
although we dont kn the values of a and b,
the x coordinate of c must be same as point D,and y coordinate of C must be same as point B.U can draw a graph to help urself understand better
although we dont kn the values of a and b,
the x coordinate of c must be same as point D,and y coordinate of C must be same as point B.U can draw a graph to help urself understand better