QUES 38 CASE STUDY-3 A maths teacher of class XI while teaching 3D geometry, gave a quadrilateral ABCD to the ts and asked them do determine the exact shape of the quadrilateral. Ramesh found the quadrilateral to be a ram while Suresh found that the rigure was not a rectar gle. If the coordinates of the vertices of the teral are A(1,2,3), B(-1,-2,-1), C(2,3,2) and D(4.7.6). Using your knowledge of 3D geometry, determine who is and why? (Show all the calculations).​