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| 1. |
Show that the four points A(4,5,1), B(0,−1,−1), C(3,9,4) and D(−4,4,4) are co-planar. |
| Answer» Show that the four points A(4,5,1), B(0,−1,−1), C(3,9,4) and D(−4,4,4) are co-planar. | |