Show that the A(1,1,1) B(-2,4,1) C(1,-5,5) D(2,2,5) are the vertices of the square.

Show that the A(1,1,1) B(-2,4,1) C(1,-5,5) D(2,2,5) are the vertices o

1.	Show that the A(1,1,1) B(-2,4,1) C(1,-5,5) D(2,2,5) are the vertices of the square.
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