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

Show that the points (4,7,8),(2,3,4),(-1,-2,1),(1,2,5) are the vertices of a parallelogram,but not a rectangle.

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

Show that the points : (4, 7, 8), (2, 3, 4), (- 1, - 2, 1), (1, 2, 5) 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 (-2,-1),(5,4),((6,7) and (-1,2) are the vertices of a parallelogram .Is the parallelogram a rectangle ?

Prove that the points (4, 8), (7, 5) , (1, -1) and (-2, 2) are the vertices of a parallelogram.

Prove that the points (4, 8), (7, 5) , (1, -1) and (-2, 2) are the vertices of a parallelogram.

Show that the points A(1,0),B(5,3),C(2,7) and D(-2,4) are the vertices of a parallelogram.

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