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8. Prove that the points (1, 1, 1), (-2, 4, 1), (- 1, 5, 5) and (2, 2, 5) are thesquare.

Answer» 8. Prove that the points (1, 1, 1), (-2, 4, 1), (- 1, 5, 5) and (2, 2, 5) are thesquare.


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