Let A = (-2, 6), B = (1, 0), and C = (5, 2). Prove that AABC 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? O BC L AC O O O AB 1 BC AB 1 AC

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