Show that the points A(4,7,8),B(2,3,4),C(-1,-2,1) and D(1,2,5), taken in order, are the vertices of a parallelogram.

Show that the points (4,7,8), (2,3,4),(-1,-2,1) and (1,2,5) taken in order from a parallelogram. Do these points form a rectangle.

Show that the points : (4, 7, 8), (2, 3, 4), (- 1, - 2, 1), (1, 2, 5) are the vertices of a parallelogram.

Prove that the points (1,1,1),(-2,4,1),(-1,5,5) and (2,2,5) taken in order ,are the vertices of a square. Find the area of square.

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 parallelogram ABCD but it is not a rectangle.

Show that the points A(3,2,1),B(4,5,5),C(4,2,-2) and D(6,5,-1) are coplanar.

Show that the points (1, 2, 3), (-1, -2, -1), (2, 3, 2) and (4, 7, 6) are the vertices of a parallelogram.

Show that the points A(1,-2,-8), B(5,0,-2) and C(11,3,7) are collinear.

Show that the points A(4,5,1), B(0,-1,-1), C(3,9,4) and D(-4,4,4) are coplanar.

Show that the points (3, -1, -1), (5,-4, 0), (2, 3, -2) and ( 0, 6, -3) are the vertices of a parallelogram*.

Show that the points : (0,4,1),(2,3,-1),(4,5,0) and (2,6,2) are vertices of square.