Let A = (1, 1, -1), B = (-3, 2, -2), and C = (2, 2, -4). Prove that ABC is a right-angled triangle. Let u = AB, v = BC, and w = AC. We must show that u. v, uw, or v w is zero in order to show that one of these pairs is orthogonal. . U. V = U. W = V. W = Based on your previous answers, it can be concluded that AABC is a right-angled triangle because of which of the following? ⒸAB L AC BC LAC AB I BC

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