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 A (5, 6), B(1,5), C(2, 1) and D(6, 2) are the vertices of a square ABCD.

Prove that the four ponts (1,1,1),(-2,4,1),(-1,5,5) and (2,2,5) 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 (3,-1,-1),(5,-4,0) ,(2,3,-2) and (0,6,-3) are the 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 the points P(2,1), Q(-1,3) , R (-5,-3) and S (-2,-5) are the vertices of a square .

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

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

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

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