20. Exemplar Example Problem V

ABCD is a parallelogram with vertices \(A (x_1  ,  y_1)\), \(B (x_2  ,  y_2 )\) and \(C (x_3  ,  y_3 )\). Find the coordinates of the fourth vertex D in terms of \(x_1\), \(x_2\), \(x_3\), \(y_1\), \(y_2\) and \(y_3\).

 

 

The coordinates of the point \(D\) is \((\) , \()\)