Show that points `P(1,-2), Q(5, 2), R(3, -1), S(-1, -5)` are the vertices of a parallelogram.

Show that the points P(1,-2), Q(5,2), R(3,-1), S(-1,-5) are the vertices of a parallelogram.

Show that points P(2,-2), Q(7,3), R(11,-1) and S(6,-6) are the vertices of a parallelogram.

Show that four points (1, -2), (3, 6), (5, 10) and (3, 2) are the vertices of a parallelogram.

Show that four points (1, -2), (3, 6), (5, 10) and (3, 2) are the vertices of a parallelogram.

If the points P(a, -11), Q(5, b), R(2, 15) and S(1, 1) are the vertices of a parallelogram PQRS, find the values of a.

Show that points P(2,-2) , Q (7,3) ,R(11,-1) and S(6,-6) are vertices of a parallelogram.

Show that the points (-2,-1),(5,4),((6,7) and (-1,2) are the vertices of a parallelogram .Is the parallelogram a rectangle ?

Show that P(3,4), Q(7, -2), R((1,1) and S(-3, 7) are the vertices of a parallelogram.

Show that the points A(1,-2),B(3,6),C(5,10) and D(3,2) are the vertices of a parallelogram.