Show that the points `A(,1,2,3),B(-1,-2,-1),C(2,3,2) and D(4,7,6)` are the vertices of a
Channel: Doubtnut
Date: 2020-04-12

Show that the points `A(,1,2,3),B(-1,-2,-1),C(2,3,2) and D(4,7,6)` are the vertices of a parallelogram ABCD but it is not a rectangle.