Complete the coordinate proof for the quadrilateral determined by the points A(7, 9), B(9, 4) , C(4, 2), D(2, 7) . Prove that ABCD is a parallelogram.

Complete the coordinate proof for the quadrilateral determined by the points A7 9 B9 4 C4 2 D2 7 Prove that ABCD is a parallelogram class=