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 A(1,2,3),B(-1,-2,-1)C(2,3,2),D(4,7,6) 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

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

Show that the points (-2,4,1),(-1,5,5),(2,2,5) and (1,1,1) are the vertices of a square.

Show that the points quad (1,7),(4,2),(-1,-1) and (-4,4) are the vertices of a square.

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 A(3, 1), B(0, -2), C(1, 1) and D(4, 4) are the vertices of a parallelogram ABCD.